Dissertations / Theses on the topic 'Module of signal generation'
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SAMPATH, HEMANTH KUMAR. "A MODULE GENERATION ENVIRONMENT FOR MIXED-SIGNAL CIRCUITS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1052321882.
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KANKIPATI, SUNDER RAJAN. "MACRO MODEL GENERATION FOR SYNTHESIS OF ANALOG AND MIXED SIGNAL CIRCUITS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1077297705.
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Von, Eden Elric Omar. "Optical arbitrary waveform generation using chromatic dispersion in silica fibers." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24780.
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Дудко, Андрій Володимирович. "Модуль генерації гідроакустичного сигналу в плоско-паралельному хвилеводі." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/28408.
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Метою дипломної роботи є створення програмного продукту для генерації гідроакустичного сигналу в плоско-паралельному хвилеводі променевим методом.
Об’єктом дослідження є способи та алгоритми моделювання сигналів. Було виконано огляд існуючих програмних застосунків для моделювання сигналів та ознайомитися із проблемами моделювання гідроакустичних сигналів, розроблено програмний продукт для генерації гідроакустичних сигналів, який реалізовано методом уявних джерел для розрахунку поля тиску в плоско-паралельному хвилеводі, даний метод відноситься до променевих моделей.
Створена програмний продукт може бути використаний, як частина системи для моделювання гідроакустичних об’єктів та для наукових досліджень.
Загальний обсяг роботи: 67 сторінок, 19 ілюстрацій, 17 бібліографічних посилань та 3 додатки.The purpose of the thesis is to create a program product for generating a hydroacoustic signal in a plane-parallel waveguide beam method. The objects of research are the methods and algorithms of signal simulation. An overview of the existing software applications for simulation of signals and the problems of modeling of hydroacoustic signals was performed, the program software of generation hydroacoustic signals, implemented by the imaginary sources for calculating the field of pressure in a plane-parallel waveguide, was implemented, this method belongs to beam models. The created program product can be used as part of the system for modeling hydroacoustic objects and for scientific research. Total volume of work: 67 pages, 19 illustrations, 17 bibliographic references and 3 attachments.
Целью дипломной работы является создание программного продукта для генерации гидроакустических сигналов в плоско-параллельном волноводе лучевым методом. Объектом исследования являются способы и алгоритмы моделирования сигналов. Было выполнено обзор существующих программных приложений для моделирования сигналов и ознакомиться с проблемами моделирования гидроакустических сигналов, разработано программный продукт для генерации гидроакустических сигналов, который реализован методом мнимых источников для расчета поля давления в плоско-параллельном волноводе, данный метод относится к лучевым моделям. Созданная программа может быть использована как часть системы для моделирования гидроакустических объектов и для научных исследований.
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Holland, Rainer. "The Rotor-Signal-Module of MFI90." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614642.
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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, CaliforniaThis paper presents special measuring equipment designed for acquiring rotor data from a BO105 helicopter. Some aspects of hardware design, especially in the field of digital data acquisition and processing will be discussed. On this occasion the limited space available on the rotor hub must be taken into consideration. The rotor-signal-module also has to function in the future measurement system MF190. The paper concludes with the presentation of a method of calibrating the measurement values from the rotor blades. In this connection measured rotor data will be compared with results obtained by a nonlinear helicopter computer simulation. This represents one possibility to check the data quality.
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Azizi, Farouk. "Microfluidic Chemical Signal Generation." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1244664596.
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Thesis(Ph.D.)--Case Western Reserve University, 2009Title from PDF (viewed on 2009-11-23) Department of Electrical Engineering Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center
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Paul, Suresh L. "Curvilinear traverse generation module for and AGV." Cincinnati, Ohio : University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1060885654.
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Paul, Suresh Lazarus. "Curvilinear Traverse Generation Module for an AGV." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060885654.
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Penharlow, David. "Signal Conditioning, the Next Generation." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614701.
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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, CaliforniaThis paper describes the changes in signal conditioning techniques used on flight test programs in recent years. Improved sensors require improved signal conditioning. Advanced distributed data acquisition systems, used on major flight test programs, move the signal conditioning closer to the sensor for improved performance and reduced wiring throughout the vehicle. These distributed systems use digital communication between the master controller and the remote conditioning units for improved accuracy and noise immunity. This requires sample- and-hold amplifiers, analog-to-digital converters, and serial encoder/decoders to be located at the signal conditioning location. The changes in signal conditioning designs are driven by the sensors, the architecture of the data acquisition systems, and by vehicle designs (smaller aircraft, smaller missiles, composite structures, and hypervelocity vehicles). A look at the signal conditioning technology employed in many of these systems as well as what is anticipated in the future is described in this paper.
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Nascimento, Leonaldo José Lyra do. "Controle térmico de alta exatidão e sua aplicação na determinação de propriedades térmicas de materiais." Universidade Federal da Paraíba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/5361.
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This paper presents a theoretical and experimental study of a PID control-Proportional, Integral and Derivative using PELTIER module that achieves precision of about 0.01oC. It is developed to study the integrated instrumentation and control heat transfer. Based on this we developed a heat signal generator on a flat surface and applied to the measurement of thermal properties, in a system similar to electrical circuit. After several experiments, the results indicates the validity of the proposal.
Neste trabalho apresenta-se um estudo teórico e experimental de um controle P.I.D.- Proporcional, Integral e Derivativo, utilizando módulos Peltier s que alcançam precisão de cerca de 0.01oC. É desenvolvido o estudo da instrumentação e controle integrado à transferência de calor. Baseado neste controle foi desenvolvido um gerador de sinais térmicos em uma superfície plana e aplicado na medida de propriedades térmicas, em um sistema semelhante ao circuito elétrico. Após vários ensaios experimentais usando amostras sólidas, os resultados indicam a validade da proposta.
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Thakur, Ravi Bhushan. "Low power design implementation of a signal acquisition module." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/4617.
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Master of ScienceDepartment of Electrical and Computer Engineering
Don M. Gruenbacher
As semiconductor technologies advance, the smallest feature sizes that can be fabricated get smaller. This has led to the development of high density FPGAs capable of supporting high clock speeds, which allows for the implementation of larger more complex designs on a single chip. Over the past decade the technology market has shifted toward mobile devices with low power consumption at or near the top of design considerations. By reducing power consumption in FPGAs we can achieve greater reliability, lower cooling cost, simpler power supply and delivery, and longer battery life. In this thesis, FPGA technology is discussed for the design and commercial implementation of low power systems as compared to ASICs or microprocessors, and a few techniques are suggested for lowering power consumption in FPGA designs. The objective of this research is to implement some of these approaches and attempt to design a low power signal acquisition module. Designing for low power consumption without compromising performance requires a power-efficient FPGA architecture and good design practices to leverage the architectural features. With various power conservation techniques suggested for every stage of the FPGA design flow, the following approach was used in the design process implementation: the switching activity is addressed in the design entry, and synthesis level and software tools are utilized to get an initial estimate of and optimize the design’s power consumption. Finally, the device choice is made based on its features that will enhance the optimization achieved in the previous stages; it is configured and real time board level power measurements are made to verify the implementation’s efficacy
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Hawrysh, Evan M. (Evan Mark). "Digital architectures for analog signal generation." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24058.
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Analog and mixed-signal testing is far more complex than its digital equivalent. This thesis will identify the analog test requirements through an extensive analysis of integrated circuit testing, possible error sources, and the different levels of test hierarchy. The results will show that analog testing requires spectrally pure, high-quality predictable test signals. These signals are most robust when reproduced through digital techniques such as direct digital frequency synthesis. Delta-sigma ($ Delta Sigma$) modulation is perhaps the most versatile technique, as it can precisely encode arbitrary analog waveforms into a pulse-density modulated (PDM), infinite-length, single bit-wide pattern. The noise-shaping characteristics of the $ Delta Sigma$ modulator also allow for simple reconstruction of the embedded signal. Unfortunately, on-chip signal generation using this method is currently hindered by the high area overhead and limited programmability of $ Delta Sigma$ modulation oscillators. We will introduce the concept of forcing the PDM pattern to be finite in length and thus periodic. Although other periodic encoding algorithms exist, forced-periodic PDM patterns will be shown to be far superior for their precise control over signal amplitude, frequency, phase, and also for their ability to encode an arbitrary waveform. Its effectiveness will be demonstrated with several experiments of single- and multi-tone waveforms of varying degrees of complexity. By creating a fixed-length pattern, we can take advantage of many common digital built-in self-test (BIST) concepts such as scan and RAMBIST, found on most digital and mixed-signal integrated circuits, to supply the necessary hardware. We will show how analog signal generation can be integrated into digital ICs using any or all of the IEEE 1149.1-1990 standard, embedded RAMs, and scan chains. These applications will indeed prove that with very little additional hardware, on-chip, high-quality analog signal gene
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Lee, Jeffrey C. "Design Considerations for a Variable sample Rate Signal Conditioning Module." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606212.
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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, CaliforniaModern telemetry systems require flexible sampling rates for analog signal conditioning within telemetry encoders in order to optimize mission formats for varying data acquisition needs and data rate constraints. Implementing a variable sample rate signal conditioning module for a telemetry encoder requires consideration of several possible architectural topologies that place different system requirements on data acquisition modules within the encoder in order to maintain adequate signal fidelity of sensor information. This paper focuses on the requirements, design considerations and tradeoffs associated with differing architectural topologies for implementing a variable sample rate signal conditioning module and the resulting implications on the encoder system's data acquisition units.
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Baptist, Lauren M. (Lauren Marianne) 1977. "Genesis-II : A language generation module for conversational systems." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/81547.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (p. 127-132).
by Lauren M. Baptist.
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Lu, Albert K. (Albert Keishi). "Analog signal generation using delta-sigma modulation." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68040.
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This thesis introduces a method by which low-frequency analog waveforms may be generated using delta-sigma modulation. The technique centers around a delta-sigma based oscillator which, with the exception of a continuous-time low-pass filter, is entirely digital and provides precise control over the oscillation frequency, amplitude, and phase. The incorporation of a delta-sigma modulator inside the resonator loop leads to an efficient implementation requiring 4 multi-bit adders, 4 delay elements, and a 2-input multiplexer. Two additional circuits, which generate multi-tone and piece-wise linear waveforms, are presented as extensions of the original single-tone design.Prototypes of the proposed designs have been assembled using Field-Programmable Gate Array, and BiCMOS technologies. The test results have successfully verified the validity of the proposed concepts indicating dynamic ranges exceeding 80 dB and 60 dB for the single and multi-tone generators respectively.
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Barrera-Gonzalez, Claudia Patricia. "Testing platform for a low voltage differential signal gigabit communication module." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 53 p, 2007. http://proquest.umi.com/pqdweb?did=1342743431&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Haurie, Xavier. "Signal generation using high-order Delta-sigma modulation." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27224.
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This work presents high-order, arbitrary-band delta-sigma oscillators. They are a class of digital circuits which, augmented with a minimum of analog circuitry requiring no trimming, generate fully programmable, high-quality analog sinusoidal signals. A generalization of previous work, they can meet arbitrary signal-band and SNR specifications at a minimum digital hardware cost, and without the previously reported stability problems. It is shown that multitone generation requires but simple modifications to the basic oscillator topology; this signal generation scheme is thus highly attractive for endowing mixed-signal integrated circuits and systems with self-test capabilities. Delta-sigma oscillators can be useful in other applications as well.An essential building block of delta-sigma oscillators is a one-bit digital delta-sigma modulator with unity Signal-Transfer-Function. A complete, computer-aided design method, relying on a novel high-order modulator topology allowing the use of power-of-two coefficients, is formulated and justified. Although the resulting modulators are aimed specifically at usage in delta-sigma oscillators, they can find applications in oversampled D/A conversion in general as they require a minimal amount of digital hardware.
DSMOD is the computer-aided design tool which was developed to automate the design, simulation and prototyping processes. It implements a number of involved design algorithms, and allows for a quick comparison of theoretical, simulated and prototype behavior, with the use of a graphical user interface. It is written mostly for MATLAB and is thus highly portable and expandable.
The measurements performed on prototypes prove the soundness, flexibility and efficiency of DSMOD. They also prove that low hardware cost and high performance levels are attainable with the novel delta-sigma modulator and oscillator topologies presented here.
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Odelius, Johan. "Generation of probe signal for feedback cancellation systems." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2095.
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A common problem of hearing aids is whistling caused by feedback from the loudspeaker back to the microphone. A method of reducing the negative effects, caused by the feedback, is called feedback cancellation. A variant of feedback cancellation uses a probe signal, which is applied to the speaker of the hearing aid and is used to continuously estimate the feedback. Oticon A/S has suggested a master's thesis with the purpose of designing and evaluating an algorithm generating a probe signal for feedback cancellation systems. The challenge was to find an inaudible probe signal with as much energy as possible.
Two approaches have been investigated for generating a probe signal. In the first approach the psychoacoustic principle of masking was used to estimate how much noise that could be added to a signal without being heard. Psychoacoustic models, including masking, are used in MPEG (Moving Pictures Expert Group) audio coding and one of these models has been examined in the thesis. In the second approach a standard LPC (Linear Prediction Coding) algorithm was used. In both the MPEG and the LPC approach, warped signal processing has been utilized improving the methods.
A listening test was performed, evaluating the methods generating the probe signal. The purpose of the test was to determine whether the noise, generated using the MPEG and LPC approach, was inaudible. A hearing aid system with feedback cancellation, using the probe signal, was also simulated. The listening test showed that the noise (probe signal) had to be lowered, much more than expected, to be inaudible. As a consequence, shown in the simulations, the feedback cancellation system, using the probe signal, had trouble identifying the feedback of the hearing aid.
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Haurie, Xavier. "Signal generation using high-order delta-sigma modulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29597.pdf.
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Bednarski, Andrzej. "Integrated Optimal Code Generation for Digital Signal Processors." Doctoral thesis, Linköping : Department of Computer and Information Science, Linköpings universitet, 2006. http://www.bibl.liu.se/liupubl/disp/disp2006/tek1021s.pdf.
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Asokan, Anu. "Signal Integrity - Aware Pattern Generation for Delay Testing." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS206/document.
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La miniaturisation des circuits intégrés permet d'avoir une intégration plus élevée dans une même puce. Cela, conduit a des problèmes de qualité dans les signaux de communication et d’alimentation comme le phénomène de bruit de diaphonie entre les interconnections (Crosstalk) et de bruit dans le lignes d'alimentation (PSN, GB). Aussi problèmes de fiabilité peuvent éventuellement arriver a cause des variations dans les paramètres technologiques pendant le processus de fabrication. De ce fait, tout ces phénomènes ont un effet négatif sur le délai dans les circuits embarques (IC) et donnent lieu aux défauts sur le retard. Des échecs relie au délai dans les dispositifs semi conducteurs causes une augmentation de taux d'évasion de défaut, une perte de rendement et une diminution dans le taux de fiabilité. Techniques de Design-For-Test ont était développée a fin d'avoir une meilleur contrôlabilité et observabilité dans les nœuds internes du circuit pour détecter et localiser facilement l’emplacement des défauts. Cependant, ils ne sont pas toujours détectés par les modèles de défauts traditionnels.Cette thèse s’intéresse a l’analyse de ces phénomènes a fin de proposer de nouvelle méthodes de test du délai en considérant les phénomènes physiques pour faire face aux défauts provenant du processus de fabrication ou de problèmes physiques. Ces méthodes comprennent l'analyse de la variation du retard d'un chemin en présence du bruit de diaphonie, du bruit d'alimentation, et les variations de processus. Additionnellement, nous développons méthodes d'essai de retard sur un chemin pour identifier les motifs de test qui peuvent causer le pire des cas de retard sur un chemin cible. Les méthodes proposées peuvent être utilisées pour caractériser la vitesse de chemin et il contribue à résoudre le problème de «speed binning». En outre, ils peuvent être utilisés dans l'amélioration de l'approche classique ATPG de génération de «patterns» et elles sont indépendantes de la technologie. L'application de ces contributions peut apporter des améliorations considérables à la qualité de test IC en assurant une meilleure couverture des défauts et en aidant à augmenter le rendement de fabrication au cours de la vitesse du «binning» dans les puces IC. L’évolution en continue de la technologie en échelle nanométriqueAdvancing nanometer technology scaling enables higher integration on a single chip with minimal feature size. As a consequence, the effects of signal and power integrity issues such as crosstalk noise between interconnects, power supply noise and ground bounce in the supply networks significantly increases. Also, reliability issues are eventually introduced by variations in the manufacturing process. These issues will negatively impact the timing characteristics in an integrated circuit (IC), as they give rise to delay defects. Delay-related parametric failures increase the defect escape rate, yield loss and diminish reliability rate. Hence, design-for-test techniques are employed to have a better controllability and observability on the internal nodes to easily detect and locate the faults. However, they are not always detected by the traditional fault models. In our work, we target these challenges and propose novel physical design-aware path delay test methods to deal with delay faults coming from manufacturing defects or physical design issues. They include the investigation of path delay variations in the presence of crosstalk noise, power supply noise, ground bounce and process variations. Based on this, we develop technology independent test methods for identifying the test patterns that may cause a worst-case delay on a target path. Then, we develop a dedicated test pattern generation method for path delay testing in the presence of crosstalk noise, power supply noise and ground noise. The proposed methods can be used to characterize the path speed and it helps to address the speed binning problem. Also, they can be employed in improving the classical ATPG approach of pattern generation. The application of these contributions can bring tremendous improvements to the IC test quality by ensuring better defect coverage and for an increased manufacturing yield during speed binning of IC chips
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Wang, Xiaoting. "Very High Efficiency Solar Cell (VHESC) sub-module measurement." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 55 p, 2008. http://proquest.umi.com/pqdweb?did=1654493881&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Bowen, John Kipp. "Dynamic Module Library Generation for FPGA-based Run-Time Reconfigurable Systems." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31088.
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Modern Field Programmable Gate Arrays (FPGAs) can implement entire run-time reconfigurable systems using partial reconfiguration. Module-based run-time reconfiguration permits the construction of custom applications at run-time using pre-compiled Intellectual Property (IP) from a module library. The need for both flexible module placement and custom inter-module communication is mostly ignored by existing modular run-time reconfiguration approaches and few existing tool flows for module generation address the need for automation. This thesis introduces an automated compile-time tool flow for generating dynamic modules that allow flexible run-time placement and communication synthesis.Master of Science
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Ahmad, Shakeel. "Stimuli Generation Techniques for On-Chip Mixed-Signal Test." Doctoral thesis, Linköpings universitet, Elektroniska komponenter, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-61712.
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With increased complexity of the contemporary very large integrated circuits the need for onchip test addressing not only the digital but also analog and mixed-signal RF blocks has emerged. The standard production test has become more costly and the instrumentation is pushed to its limits by the leading edge integrated circuit technologies. Also the chip performance for high frequency operation and the area overhead appear a hindrance in terms of the test access points needed for the instrumentation-based test. To overcome these problems, test implemented on a chip can be used by sharing the available resources such as digital signal processing (DSP) and A/D, D/A converters to constitute a built-in-self-test. In this case, the DSP can serve both as a stimuli generator and response analyzer. Arbitrary test signals can be achieved using DSP. Specifically, the ΣΔ modulation technique implemented in software is useful to encode a single- or two-tone stimulus as a onebit sequence to generate a spectrally pure signal with a high dynamic range. The sequence can be stored in a cyclic memory on a chip and applied to the circuit under test using a buffer and a simple reconstruction filter. In this way ADC dynamic test for harmonic and intermodulation distortion is carried out in a simple setup. The FFT artifacts are avoided by careful frequency planning for low-pass and band-pass ΣΔ encoding technique. A noise shaping based on a combination of low- and band-pass ΣΔ modulation is also useful providing a high dynamic range for measurements at high frequencies that is a new approach. However, a possible asymmetry between rise and fall time due to CMOS process variations in the driving buffer results in nonlinear distortion and increased noise at low frequencies. A simple iterative predistortion technique is used to reduce the low frequency distortion components by making use of an on-chip DC calibrated ADC that is another contribution of the author. Some tests, however, like the two-tone RF test that targets linearity performance of a radio receiver, require test stimuli based on a dedicated hardware. For the measurement of the thirdor second-intercept point (IP3/IP2) a spectrally clean stimulus is essential. Specifically, the second- or third-order harmonic or intermodulation products of the stimulus generator should be avoided as they can obscure the test measurement. A challenge in this design is the phase noise performance and spurious tones of the oscillators, and also the distortion-free addition of the two tones. The mutual pulling effect can be minimized by layout isolation techniques. A new two-tone RF generator based on a specialized phase-locked loop (PLL) architecture is presented as a viable solution for IP3/IP2 on-chip test. The PLL provides control over the frequency spacing of two voltage controlled oscillators. For the two-tone stimulus a highly linear analog adder is designed to limit distortion which could obscure the IP3 test. A specialized feedback circuit in the PLL is proposed to overcome interference by the reference spurs. The circuit is designed using 65 nm CMOS process. By using a fine spectral resolution the observed noise floor can be reduced to enable the measurement of second- or third-order intermodulation product tones. This also reflects a tradeoff between the test time and the test performance. While the test time to collect the required number of samples can be of milliseconds the number of samples need not be excessive, since the measurements are carried out at the receiver baseband, where the required sampling frequency is relatively low.
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Dufort, Benoit. "Analog signal generation using periodic sigma-delta modulated streams." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/NQ55325.pdf.
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Liao, Stan Yi-Huang 1972. "Code generation and optimization for embedded digital signal processors." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11048.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.Vita.
Includes bibliographical references (p. [203]-211).
by Stan Yi-Huang Liao.
Ph.D.
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Yang, Xin. "Pulse-shaping assisted nonlinear optical signal generation in fibres." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/359906/.
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This thesis investigates pulse-shaping assisted nonlinear optical signal generation in fibers. A linear pulse shaping stage is included in nonlinear fibre optic systems to achieve flexible and precise control over the characteristics of the output signal. The nonlinear generation of broadband spectra with desired characteristics is demonstrated as a first application of this technique. The key feature is that the linear filtering stage is placed prior to the nonlinear broadening stage in the system. A numerical simulation procedure is established to find the appropriate transfer functions of the programmable pulse shaper based on the backward propagation in a fibre. Consequently, an adaptive pulse shaping system exploiting evolutionary algorithms is built and employed to facilitate automatic convergence to the desired spectrum. The nonlinear generation of ultra-fast broadband spectra with different bandwidths is demonstrated. Additionally, the generation of broadband spectra with symmetric and linear edges exhibiting slopes of different steepness is also presented. As a second application of this technique, the linear filtering stage is incorporated into the cavity of a passively mode-locked erbium-doped fibre ring laser (EFRL). The aim here is to achieve flexible and precise control over the temporal waveforms of the laser pulses. In order to find the appropriate laser configuration which allows for the manipulation of the characteristics of the laser pulses through intra-cavity spectral filtering, both all anomalous dispersion and all-normal dispersion cavities are numerically studied. The influence of intra-cavity amplitude filtering and net dispersion on the characteristics of laser pulses in a passively mode-locked dispersion-managed (DM) EFRL is experimentally demonstrated.
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Ehteshami, Nasrin. "Silicon Photonic Devices for Microwave Signal Generation and Processing." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34111.
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Silicon photonics as a one of the most promising photonic integration technologies has attracted many attentions in recent years. The major feature of this technology is its compatibility with complementary metal-oxide semiconductor (CMOS) processes which makes it possible to integrate optical and electronic devices in a same chip and reduce the cost significantly. Another reason of using silicon photonics is the high index contrast between the silicon core and silicon dioxide cladding which ensures the high density integration of photonic devices on a single chip. Monolithic integration with electronic and optical circuits makes silicon photonics technology suitable for numerous applications. One example is microwave photonics (MWP). MWP is an area that studies the interaction between microwave and optical signal for the generation, processing, control and distribution of microwave signals by means of photonics. Silicon photonics offers a reduction in footprint, losses, packaging cost and power dissipation in MWP systems.
This research in this thesis is focused on the design and fabrication of the silicon photonic devices for MWP signal processing and generation. Four MWP systems based on silicon photonic devices are proposed and experimentally demonstrated.
1) A single pass-band frequency-tunable MWP filter based on phase-modulation to intensity-modulation conversion in an optically pumped silicon-on-insulator (SOI) microring resonator (MRR) is designed and experimentally demonstrated. In the proposed filter, a phase-modulated optical signal is filtered by the SOI MRR, to have one first-order sideband suppressed by the MRR notch. The phase-modulated optical signal is converted to an intensity-modulated single-sideband (SSB) signal and detected at a photodetector (PD). The entire operation is equivalent to a single pass-band filter. The frequency tunability is achieved by tuning the resonance wavelength of the MRR, which is realized by optically pumping the MRR. A single pass-band MWP filter with a tunable center frequency from 16 to 23 GHz is experimentally demonstrated.
2) A broadband optically tunable MWP phase shifter with a tunable phase shift using three cascaded SOI MRRs that are optically pumped is designed and experimentally demonstrated. A microwave signal to be phase shifted is applied to an optical single-sideband (OSSB) modulator to generate an optical carrier and an optical sideband. The phase shift is introduced to the optical carrier by placing the optical carrier within the bandwidth of one resonance of the three cascaded MRRs. The experimental results show that by optically pumping the cascaded MRRs, a broadband MWP phase shifter with a bandwidth of 7 GHz with a tunable phase shift covering the entire 360o phase shift range is achieved.
3) A multi tap MWP filter with positive and negative coefficients using a silicon ring resonator modulator (RRM) is proposed and experimentally demonstrated. The RRM is designed and fabricated to operate based on the carrier depletion effect. The positive and negative coefficients are obtained by using opposite slopes of the modulation transmission response of the RRM. Two filter responses with two and three taps are experimentally demonstrated, showing the proof-of-principle for frequencies up to 18 GHz.
4) An approach to generate microwave signal based on enhanced four wave mixing (FWM) in an active silicon waveguide (SiWG) is studied. This SiWG is designed and fabricated, and the use of the active SiWG for MWP frequency multiplication to generate a frequency-sextupled millimeter-wave signal is experimentally demonstrated. Thanks to a reverse-biased p-n junction across the SiWG, the conversion efficiency of the FWM is improved, which leads to the improvement of the microwave frequency multiplication efficiency.
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Navarro, Roy Daniel Alva. "Signals of new physics at the LHC and colliders of future generation." reponame:Repositório Institucional da UFABC, 2016.
Find full textAbstract:
Orientador: Prof. Dr. José Kenichi MizukoshiTese (doutorado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2016.
Searches for new physics beyond the Standard Model are important subjects at the current Run-2 of the Large Hadron Collider (LHC) and next generation colliders. In this context, we make independent studies of the phenomenology of a new hypothetical heavy Majorana neutrino (N) and a heavy spin-1 charged vector (W¿) at the LHC and a future 100 TeV very large hadron collider (VLHC), we also study the potential of the future International Linear Collider (ILC) to measure the rare h ! Z Higgs decay. Toward this end, the N production via the W fusion process is investigated and found it to be larger than the Drell-Yan production for mN > 1 TeV at the 14 TeV LHC and for mN > 770 GeV at the 100 TeV VLHC. Then we computed the discovery potential of the these colliders to discover an N using the same-sign dimuon channel. In the case of the h ! Z Higgs decay we investigated the Higgsstrahlung production at the 250 GeV ILC, we found that a sensitivity of 58% can be reached in the inclusive ¿Ê¿Ê X channel with 3 ab.1, where X denotes the inclusive decay of the Z boson from the Higgs. Finally, in the case of the W¿, we studied its contribution to the h ! Higgs decay process and constrained the strength of the W¿W¿h interaction. Finally, we study the Drell-Yan W¿ production with its decay to the Wh pair at the LHC.
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Johan, Berneland. "Design and Construction of Relay-Based RF-SignalSwitching Module for High Signal Integrity." Thesis, Linköpings universitet, Elektroniksystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-109694.
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This thesis work consists of constructing and validating a module designed tofacilitate automatic testing of digitizers at SP Devices. The focus of the report isthe use of simulations of transmission lines to maximise signal integrity. Signalintegrity is discussed mainly from an electromagnetic point of view and the parametersaffecting the signal integrity are presented and discussed. It is shownthat simulations using 2D field solvers work well in the cases where 2D modelsare applicable, while 3D field solvers should be used in other cases. The importanceof simulating all transmission line features is seen in the resulting measurementsas the characteristic impedance misses the mark in the cases that are notsufficiently simulated.The design of a trigger generation circuitry is presented and the resulting mismatchbetween Spice simulations and results are discussed and analysed.
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Eilermann, Martin [Verfasser]. "Generation of an Equipment Module Database Considering Industrial Process Tasks / Martin Eilermann." München : Verlag Dr. Hut, 2018. http://d-nb.info/1168534429/34.
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AKYOL, MUCAHIT. "DESIGN OF A SWITCH BLOCK MODULE FOR SECOND GENERATION MULTI-TECHNOLOGY FPGA." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1159558241.
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Messaoud, Safa. "Translating Discrete Time SIMULINK to SIGNAL." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49299.
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As Cyber Physical Systems (CPS) are getting more complex and safety critical, Model Based
Design (MBD), which consists of building formal models of a system in order to be used in
verification and correct-by-construction code generation, is becoming a promising methodology
for the development of the embedded software of such systems. This design paradigm
significantly reduces the development cost and time while guaranteeing better robustness,
capability and correctness with respect to the original specifications, when compared with
the traditional ad-hoc design methods. SIMULINK has been the most popular tool for embedded
control design in research as well as in industry, for the last decades. As SIMULINK
does not have formal semantics, the application of the model based design methodology and
tools to its models is very limited. In this thesis, we present a semantic translator that
transform discrete time SIMULINK models into SIGNAL programs. The choice of SIGNAL
is motivated by its polychronous formalism that enhances synchronous programming with
asynchronous concurrency, as well as, by the ability of its compiler of generating deterministic
multi thread code. Our translation involves three major steps: clock inference, type
inference and hierarchical top-down translation. We validate the semantic preservation of
our prototype tool by testing it on different SIMULINK models.Master of Science
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Chowdhury, Azhar. "A probabilistic test instrument using sigma-delta phase signal generation technique for mixed signal embedded test." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107696.
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A probabilistic test instrument is proposed for mixed-signal embedded test applications. The system architecture of the instrument and its implementation is presented. The instrument can be used to inject and extract the timing and voltage information associated with signals in high-speed transceiver circuits that are commonly found in data communication applications. Using statistical methods, the probability distributions associated with these signals can be extracted using a simple circuit called a probability extraction unit, consisting of a few simple digital logic gates. At the core of this work is the use of ΣΔ phase-encoding technique to generate both the voltage and timing (phase) references, or strobes used for high-speed sampling. This technique is also used for generating the test stimulant for the device-under-test, or DUT as a shorthand notation. Experimental results reveal the sampling time strobe can be programmed over a phase range of 45 degrees with a phase step of 1 degree at a fixed voltage reference. The DUT stimulant and the timing and voltage references are all programmable in software. This provides additional flexibility and versatility when conducting a test. A prototype of the proposed test instrument was implemented using discrete components assembled on a printed-circuit board and shown to be capable of measuring the output jitter distribution associated with a clock and data signal of a DUT. It was further extended to measure the phase and frequency response of various analog channels associated with the DUT. The performance of the instrument was evaluated by comparing the test results with those obtain using other test techniques, independent of the instrument.Un instrument pour les tests "mixed-signal" basé sur une approche statistique est proposé. L'architecture du système ainsi que son implémentation sont présentés. L'instrument peut être utilisé afin d'injecter ou de capturer des informations en temps et voltage associé aux signaux de hautes fréquences dans les systèmes de communication. En utilisant une approche statistique, la distribution de probabilité associée à un signal peut être calculée à l'aide d'un circuit appelé « probability extraction unit » implémenté de façon digital. De plus, l'utilisation de ΣΔ pour encoder des signaux dans la phase afin de générer des signaux dans le temps ainsi que des références pour du « high speed sampling » est démontré. Les résultats expérimentaux démontrent que des variations de phase de 45 degrés avec des intervalles de1 degré est possible. Ceci permet donc plus de flexibilité pour générer des signaux de tests qui sont programmables. Un prototype de cette technique fut implémenté sur « PCB » afin de démontrer que la technique est fonctionnelle. Les résultats des tests furent également comparés à ceux obtenus avec des instruments de mesures traditionnels et démontrent une excellente corrélation entre la méthode développée et les méthodes existantes.
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Nordio, Alessandro. "Advanced signal processing algorithms for 3rd generation wireless mobile systems /." [S.l.] : [s.n.], 2002. http://library.epfl.ch/theses/?nr=2550.
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Rosati, Stefano <1982>. "Advanced signal and receiver design for next generation OFDM systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3828/.
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This thesis deal with the design of advanced OFDM systems. Both waveform and receiver design have been treated. The main scope of the Thesis is to study, create, and propose, ideas and novel design solutions able to cope with the weaknesses and crucial aspects of modern OFDM systems.
Starting from the the transmitter side, the problem represented by low resilience to non-linear distortion has been assessed. A novel technique that considerably reduces the Peak-to-Average Power Ratio (PAPR) yielding a quasi constant signal envelope in the time domain (PAPR close to 1 dB) has been proposed.The proposed technique, named Rotation Invariant Subcarrier Mapping (RISM),is a novel scheme for subcarriers data mapping,where the symbols belonging to the modulation alphabet are not anchored, but maintain some degrees of freedom. In other words, a bit tuple is not mapped on a single point, rather it is mapped onto a geometrical locus,
which is totally or partially rotation invariant.
The final positions of the transmitted complex symbols are chosen by an iterative optimization process in order to minimize the PAPR of the resulting OFDM symbol.
Numerical results confirm that RISM makes OFDM usable even in severe non-linear channels.
Another well known problem which has been tackled is the vulnerability to synchronization errors.
Indeed in OFDM system an accurate recovery of carrier frequency and symbol timing is crucial for the proper demodulation of the received packets.
In general, timing and frequency synchronization is performed in two separate phases called PRE-FFT and POST-FFT synchronization.
Regarding the PRE-FFT phase, a novel joint symbol timing and carrier frequency synchronization algorithm has been presented.
The proposed algorithm is characterized by a very low hardware complexity, and, at the same time, it guarantees very good performance in in both AWGN and multipath channels.
Regarding the POST-FFT phase, a novel approach for both pilot structure and receiver design has been presented. In particular, a novel pilot pattern has been introduced in order to minimize the occurrence of overlaps between two pattern shifted replicas. This allows to replace conventional pilots with nulls in the frequency domain, introducing the so called Silent Pilots.
As a result, the optimal receiver turns out to be very robust against severe Rayleigh fading multipath and characterized by low complexity.
Performance of this approach has been analytically and numerically evaluated. Comparing the proposed approach with state of the art alternatives, in both AWGN and multipath fading channels, considerable performance improvements have been obtained.
The crucial problem of channel estimation has been thoroughly investigated, with particular emphasis on the decimation of the Channel Impulse Response (CIR) through the selection of the Most Significant Samples (MSSs).
In this contest our contribution is twofold, from the theoretical side, we derived lower bounds on the estimation mean-square error (MSE) performance for any MSS selection strategy,from the receiver design we proposed novel MSS selection strategies which have been shown to approach these MSE lower bounds, and outperformed the state-of-the-art alternatives.
Finally, the possibility of using of Single Carrier Frequency Division Multiple Access (SC-FDMA) in the Broadband Satellite Return Channel has been assessed.
Notably, SC-FDMA is able to improve the physical layer spectral efficiency with respect to single carrier systems, which have been used so far in the Return Channel Satellite (RCS) standards.
However, it requires a strict synchronization and it is also sensitive to phase noise of local radio frequency oscillators.
For this reason, an effective pilot tone arrangement within the SC-FDMA frame, and a novel Joint Multi-User (JMU) estimation method for the SC-FDMA, has been proposed.
As shown by numerical results, the proposed scheme manages to satisfy strict synchronization requirements and to guarantee a proper demodulation of the received signal.
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Magden, Emir Salih. "Optical signal generation, stabilization, and manipulation in broadband silicon photonics." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115769.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 169-175).
Together with the increasing number of applications in vastly different parts of the electromagnetic spectrum, more versatile, stable, and capable light generation and manipulation techniques are required in integrated photonics. In this thesis, using CMOS fabrication capabilities, and a single layer back-end deposition process, CMOS-compatible lasers are developed using aluminum oxide as the host medium. First, a low temperature deposition process is detailed, and erbium-based lasers are demonstrated in the C-band. Then, thulium is studied and characterized as a dopant for applications at longer wavelengths. On-chip frequency stability issues are addressed by investigating the thermo-optic characteristics of various CMOS-compatible media. Negative thermo-optic coefficient of titanium dioxide is utilized to compensate for the all-positive thermal index shifts in the Si/SiN waveguide platform. An athermal resonator with resonances that exhibit ultra-low thermal shifts is created and used to stabilize a continuous-wave laser. Compared to a conventional SiN resonator, the athermal resonator is shown to significantly reduce the frequency noise of a locked laser. Switching to design-based solutions, the concept of spectrally-selective waveguides that can spatially confine the mode depending on the wavelength are demonstrated for the first time. The spectrally-selective waveguides are then used to design and demonstrate the first on-chip transmissive dichroic filter with the sharpest roll-offs to date. Finally, directional coupler based solutions are studied to address wavelength selectivity for octave-wide signals, and propose designs for ultra-wideband couplers.
by Emir Salih Magden.
Ph. D.
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Muñoz-Arcos, Christian Daniel. "Optical Microwave Signal Generation for Data Transmission in Optical Networks." Thesis, Toulouse, ISAE, 2020. http://www.theses.fr/2020ESAE0013.
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La croissance des services de télécommunications et l’augmentation du trafic de données àl’échelle mondiale favorise le développement et l’intégration de différents réseaux de transmissionde données. Un exemple de ce développement est constitué par les réseaux defibres optiques, qui sont actuellement chargés d’interconnecter les continents par des liaisonslongues avec des taux de transfert importants. Les réseaux optiques, ainsi que les réseauxsupportés par d’autres moyens de transmission, utilisent des signaux électriques à certainesfréquences pour la synchronisation des éléments du réseau. La qualité de ces signaux est unfacteur décisif dans la performance globale du système, c’est pourquoi leur bruit de phasedoit ˆetre aussi faible que possible.Ce document décrit la conception et la mise en œuvre d’un système optoélectronique pour lagénération de signaux micro-ondes à l’aide de diodes laser à cavité verticale (VCSEL) et sonintégration dans un système de transmission optique de données. Compte tenu du fait que lesystème proposé intègre un laser VCSEL directement modulé, une caractérisation théoriqueet expérimentale a été élaborée sur la base des équations d’évolution du laser, de mesuresdynamiques et statiques, et d’un modèle électrique équivalent de la région active. Cetteméthode a permis l’extraction de certains paramètres intrinsèques du VCSEL, ainsi que lavalidation et la simulation de ses performances dans différentes conditions de modulation.Le VCSEL utilisé émet en bande C et a été sélectionné en considérant que cette bande estcouramment utilisée dans les liaisons à longue distance.Le système proposé est constitué d’une boucle fermée qui déclenche l’oscillation grâce auxsources de bruit des composants et module le VCSEL en fort signal pour générer des impulsionsoptiques (gain switching). Ces impulsions optiques, qui dans le domaine des fréquencescorrespondent à un peigne de fréquences optiques, sont détectées pour générer simultanémentune fréquence fondamentale (déterminée par un filtre passe-bande) et plusieurs harmoniques.Le bruit de phase mesuré à10 kHz de la porteuse à1,25 GHz est de -127,8 dBc/Hz, etconstitue la valeur la plus faible signalée dans la littérature pour cette fréquence et cette architecture.La gigue et la largeur d’impulsion optique ont été déterminées lorsque différentescavités résonantes et différents courants de polarisation étaient utilisés. La durée d’impulsionThe massive growth of telecommunication services and the increasing global data traffic boostthe development, implementation, and integration of different networks for data transmission.An example of this development is the optical fiber networks, responsible today for theinter-continental connection through long-distance links and high transfer rates. The opticalnetworks, as well as the networks supported by other transmission media, use electricalsignals at specific frequencies for the synchronization of the network elements. The qualityof these signals is usually determined in terms of phase noise. Due to the major impact ofthe phase noise over the system performance, its value should be minimized.The research work presented in this document describes the design and implementation ofan optoelectronic system for the microwave signal generation using a vertical-cavity surfaceemittinglaser (VCSEL) and its integration into an optical data transmission system. Consideringthat the proposed system incorporates a directly modulated VCSEL, a theoreticaland experimental characterization was developed based on the laser rate equations, dynamicand static measurements, and an equivalent electrical model of the active region. This proceduremade possible the extraction of some VCSEL intrinsic parameters, as well as thevalidation and simulation of the VCSEL performance under specific modulation conditions.The VCSEL emits in C-band, this wavelength was selected because it is used in long-haullinks. The proposed system is a self-initiated oscillation system caused by internal noise sources,which includes a VCSEL modulated in large signal to generate optical pulses (gain switching).The optical pulses, and the optical frequency comb associated, generate in electricaldomain simultaneously a fundamental frequency (determined by a band-pass filter) and severalharmonics. The phase noise measured at 10 kHz from the carrier at 1.25 GHz was -127.8dBc/Hz, and it is the lowest value reported in the literature for this frequency and architecture.Both the jitter and optical pulse width were determined when different resonantcavities and polarization currents were employed. The lowest pulse duration was 85 ps andwas achieved when the fundamental frequency was 2.5 GHz. As for the optical frequencycomb, it was demonstrated that its flatness depends on the electrical modulation conditions.The flattest profiles are obtained when the fundamental frequency is higher than the VCSELrelaxation frequency. Both the electrical and the optical output of the system were integrated into an optical transmitter.The electrical signal provides the synchronization of the data generating equipment,whereas the optical pulses are employed as an optical carrier. Data transmissions at 155.52Mb/s, 622.08 Mb/s and 1.25 Gb/s were experimentally validated. It was demonstrated thatthe fundamental frequency and harmonics could be extracted from the optical data signaltransmitted by a band-pass filter. It was also experimentally proved that the pulsed returnto-zero (RZ) transmitter at 1.25 Gb/s, achieves bit error rates (BER) lower than 10−9 whenthe optical power at the receiver is higher than -33 dBm. la plus faible, 85 ps, a été obtenue lorsque la fréquence fondamentale du système était de 2,5 GHz. En ce qui concerne le peigne de fréquences optiques, il a été démontré que la formedu peigne dépend des conditions de modulation électrique et que les profils les plus platssont obtenus lorsque la fréquence fondamentale est supérieure à la fréquence de relaxationdu VCSEL. Les sorties électrique et optique du système ont été intégrées dans un émetteur optique. Lesignal électrique permet la synchronisation de l’équipement responsable de la génération desdonnées, tandis que les impulsions optiques sont utilisées comme porteuse optique. La transmissionde données à 155,52 Mb/s, 622,08 Mb/s et 1,25 Gb/s a été validée expérimentalement
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Le, Harivel de Gonneville Patrick. "Etude de faisabilité d'un module de réception radar tout numérique." Dijon, 2002. http://www.theses.fr/2002DIJOS010.
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Ozharar, Sarper. "STABLE OPTICAL FREQUENCY COMB GENERATION AND APPLICATIONS IN ARBITRARY WAVEFORM GENERATION, SIGNAL PROCESSING AND OPTICAL DATA M." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3516.
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This thesis focuses on the generation and applications of stable optical frequency combs. Optical frequency combs are defined as equally spaced optical frequencies with a fixed phase relation among themselves. The conventional source of optical frequency combs is the optical spectrum of the modelocked lasers. In this work, we investigated alternative methods for optical comb generation, such as dual sine wave phase modulation, which is more practical and cost effective compared to modelocked lasers stabilized to a reference. Incorporating these comblines, we have generated tunable RF tones using the serrodyne technique. The tuning range was ±1 MHz, limited by the electronic waveform generator, and the RF carrier frequency is limited by the bandwidth of the photodetector. Similarly, using parabolic phase modulation together with time division multiplexing, RF chirp extension has been realized. Another application of the optical frequency combs studied in this thesis is real time data mining in a bit stream. A novel optoelectronic logic gate has been developed for this application and used to detect an 8 bit long target pattern. Also another approach based on orthogonal Hadamard codes have been proposed and explained in detail. Also novel intracavity modulation schemes have been investigated and applied for various applications such as a) improving rational harmonic modelocking for repetition rate multiplication and pulse to pulse amplitude equalization, b) frequency skewed pulse generation for ranging and c) intracavity active phase modulation in amplitude modulated modelocked lasers for supermode noise spur suppression and integrated jitter reduction. The thesis concludes with comments on the future work and next steps to improve some of the results presented in this work.Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD
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Ozharar, Sarper. "Stable optical frequency comb generation and applications in arbitrary waveform generation, signal processing and optical data mining." Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002388.
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Amorosi, Davide. "Analog signal generation with Raspberry Pi boards for short-range communications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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The aim of this thesis is to realise a low-cost wireless application for short range underwater communications, using ultrasonic frequencies. The project can be described in four main steps. The first one is a detailed study of the serial peripheral interface. It has been carried out in order to understand how to physically and logically connect, through SPI, the hardware involved in this work: a Raspberry Pi 3 model B and the MCP4822 digital to analog converter embedded in the ADC-DAC Pi Zero module. The second phase concerns a Simulink model created in order to reduce the complexity of the problem. It has been useful as a guideline for the development of the software. Then, the implementation step includes the full execution of the code, which processes information data and digital samples of a sine wave and converts them in their respective analog signals. Configurable parameters, as the amplitude and the frequency of the sinusoidal carrier, provide more flexibility to the system. The last testing phase consists in several measurements on the hardware to assess the reliability of the system, varying some parameters and comparing these results with the simulations, run on Simulink. The overall performance respects the low-cost nature of the Raspberry Pi: the analog signals exhibit phase noise due to the not perfect periodicity of the SPI clock but they are still reliable and clear enough for project purposes.
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Deng, Zhichao. "Mode locked fiber lasers and their application in microwave signal generation." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26886.
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An investigation of mode-locked fiber ring lasers and their applications in photonic generation of microwave signals is presented in this thesis. Both passive mode locking and active mode locking are investigated.
For the passive mode-locking, a fiber laser with figure-eight structure that incorporates a nonlinear amplifying loop mirror as a saturable absorber is proposed and demonstrated. One application of the demonstrated passively mode locked fiber ring laser is to generate high-quality microwave signals. In this thesis, a microwave signal generated by beating the mode-locked longitudinal modes at a photodetector is realized. The results show that the generated microwave signal has low phase noise with high stability.
Multiwavelength mode locked laser can find many applications in optical communications. In this thesis, a multiwavelength passively mode-locked fiber ring laser using cascaded fiber Bragg gratings is proposed and demonstrated. It is different from multiwavelength active mode locking in which the round-trip frequencies for all wavelengths must be identical; for passive mode locking, it is demonstrated theoretically and experimentally that the round-trip frequencies are not necessarily identical. A three-wavelength fiber ring laser that is passively mode locked with non-identical round-trip frequencies is demonstrated. (Abstract shortened by UMI.)
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Dumenil, Arnaud. "Polarization dependent loss in next-generation optical networks : challenges and solutions." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAS006.
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La demande de débit en augmentation constante requiert des canaux de communication fiables et robustes. Les réseaux optiques terrestres ainsi que les liens sous-marins représentent le cœur de l'infrastructure des télécommunications au niveau mondial, et transportent des centaines de canaux fréquentiels modulés à haut débit. Ces liens se composent non seulement de kilomètres de fibre mais aussi de composants optiques comme les amplificateurs à fibre dopée à l'erbium (EDFA) pour relever régulièrement la puissance des signaux atténués, ou encore des commutateurs sélectifs en longueur d'onde (WSS) qui routent le signal vers leur destination. Dans cette thèse, nous nous intéressons à une pénalité spécifique qui survient dans ces systèmes et qui réduit le débit d'information dans une propagation optique. Les composants optiques discrets présentent typiquement une anisotropie en polarisation : un déséquilibre de perte (ou gain) apparaît entre les deux polarisations d'un signal optique multiplexé en polarisation. Cet effet non unitaire appelé pertes dépendant de la polarisation (abrégé PDL en anglais) dégrade la qualité de transmission dans les systèmes optiques actuels et futurs.Dans le cadre des transmissions multiplexés en polarisation, nous caractérisons la perte de capacité induite par la PDL. Pour commencer, des modèles de canal sont attentivement étudiés et deux approches sont présentées : un canal avec des éléments PDL distribués avec un bruit également distribué, ou alors un canal équivalent simplifié en un seul élément. Nous analysons les limites fondamentales de communication associées à ces modèles. Nous montrons en outre que la capacité d'un canal PDL dépend en pratique de l'orientation de l'état de polarisation du signal incident. Nous passons ensuite en revue l'état de l'art de schémas de modulation atténuant l'effet de PDL puis nous proposons deux nouveaux schémas de modulation multi-dimensionnels qui augmentent la performance minimum et moyenne du canal. Ces deux modulations sont des transformations unitaires de symboles M-QAM qui n'utilisent pas de degrés de liberté autres que les quatre déjà utilisés pour chaque longueur d'onde (encodage en phase et quadrature de phase sur les deux états de polarisation). Nous proposons succinctement une extension de ces premiers résultats à des communications optiques plus généralement multiplexés en dimension spatiale et impactées par des pertes dépendantes de mode, qui présentent un déséquilibre de gain identique. Au-delà de la construction de modulations au niveau du transmetteur, nous étudions la perte de performance en présence de PDL d'une chaîne de traitement de signal conventionnelle et séquentielle par comparaison avec une égalisation et décodage joint. Cette perte additionnelle de capacité résultant du traitement séquentiel non optimal est évaluée pour différents formats de modulations ainsi que différents points de fonctionnement. Enfin, nous exposons une validation expérimentale des deux schémas de modulation proposés, aussi bien sur un élément de PDL seul ou sur un canal PDL distribué, et montrons comme attendu une robustesse augmentée vis-à-vis de la PDLLarge amounts of ever-increasing global data traffic require sound and reliable communication channels. Optical terrestrial networks and submarine links are at the very heart of the global telecom infrastructure, and carry hundreds of frequency channels modulated at very high rates. These links include not only kilometers of fiber but also optical elements such as Erbium-Doped Fiber-Amplifiers (EDFA) to amplify periodically the attenuated signals and Wavelength Selective Switches (WSS) to route the signals to their assigned destinations. In this thesis, we explore a specific rate-degrading impairment of the optical propagation that raises in those systems. Discrete optical elements often exhibit a polarization anisotropy that emerges as a gain or loss imbalance between the two polarization tributaries of the polarization-multiplexed optical signals. This non-unitary effect called Polarization Dependent Loss (PDL) impairs the quality of transmission in current and next-generation optical systems.In the context of polarization-multiplexed signals, we assess the capacity loss induced by PDL. First, channel models are carefully studied and two approaches are described: a channel with distributed PDL elements and distributed noise or a simplified single-element equivalent channel. Making use of these models, we then analyze their fundamental limits of communications. We show that the PDL channel capacity depends in practice on the state-of-polarization orientation of the incident signal. We then review the state-of-the art of PDL-mitigating modulation schemes and propose two new multi-dimensional signaling schemes that enhance worst-case and average performance. These two modulations are unitary transforms of M-QAM symbols and do not make use of additional degrees of freedom apart from the four already-used dimensions per wavelength (in-phase and quadrature channels of two polarization states). We briefly extend these first results to space-division-multiplexed optical communications impaired by mode dependent loss (MDL) that present a similar gain imbalance. Beyond signal shaping at the transmitter side, we study the performance loss of a conventional, sequential signal processing chain at the receiver side in presence of PDL, in comparison with a joint equalization-decoding scheme. The additional capacity loss due to the mismatch sequential processing is evaluated for several modulation formats and at different operating points. Finally, we report an experimental validation of the two proposed signaling schemes, both on a single PDL element and on a distributed PDL channel, demonstrating the predicted enhanced robustness to PDL
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Kavak, Fatih. "A Sizing Algorithm for Non-Overlapping Clock Signal Generators." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2416.
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The non-overlapping clock signal generator circuits are key elements in switched capacitor circuits since non-overlapping clock signals are generally required. Non-overlapping clock signals means signals running at the same frequency and there is a time between the pulses that none of them is high. This time (when both pulses are logic 0) takes place when the pulses are switching from logic 1 to logic 0 or from logic 0 to logic 1. In this thesis this type of clock signal generators are analyzed and designed for different requirements on the switched capacitor (S/C) circuits. Different analytical models for the delay in CMOS inverters are studied. The clock generators for digital circuits based on phase-locked loop and delay-locked loop are also studied. An algorithm, which can automatically size the non-overlapping clock generator circuits, was implemented.
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Huynh, Sam DuPhat. "Testability analysis for mixed analog/digital circuit test generation and design for test /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/6134.
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Cui, Hongzhu. "In Silico Edgetic Profiling and Network Analysis of Human Genetic Variants, with an Application to Disease Module Detection." Digital WPI, 2020. https://digitalcommons.wpi.edu/etd-dissertations/596.
Full textAbstract:
In the past several decades, Next Generation Sequencing (NGS) methods have produced large amounts of genomic data at the exponentially increasing rate. It has also enabled tremendous advancements in the quest to understand the molecular mechanisms underlying human complex traits. Along with the development of the NGS technology, many genetic variation and genotype–phenotype databases and functional annotation tools have been developed to assist scientists to better understand the intricacy of the data. Together, the above findings bring us one step closer towards mechanistic understanding of the complex phenotypes. However, it has rarely been possible to translate such a massive amount of information on mutations and their associations with phenotypes into biological or therapeutic insights, and the mechanisms underlying genotype-phenotype relationships remain partially explained. Meanwhile, increasing evidence shows that biological networks are essential, albeit not sufficient, for the better understanding of these mechanisms. Among them, protein- protein interaction (PPI) network studies have attracted perhaps most attention. Our overarching goal of this dissertation is to (i) perform a systematic study to investigate the role of pathogenic human genetic variant in the interactome; (ii) examine how common population-specific SNVs affect PPI network and how they contribute to population phenotypic variance and disease susceptibility; and (iii) develop a novel framework to incorporate the functional effect of mutations for disease module detection. In this dissertation, we first present a systematic multi-level characterization of human mutations associated with genetic disorders by determining their individual and combined interaction-rewiring effects on the human interactome. Our in-silico analysis highlights the intrinsic differences and important similarities between the pathogenic single nucleotide variants (SNVs) and frameshift mutations. Functional profiling of SNVs indicates widespread disruption of the protein-protein interactions and synergistic effects of SNVs. The coverage of our approach is several times greater than the recently published experimental study and has the minimal overlap with it, while the distributions of determined edgotypes between the two sets of profiled mutations are remarkably similar. Case studies reveal the central role of interaction- disrupting mutations in type 2 diabetes mellitus and suggest the importance of studying mutations that abnormally strengthen the protein interactions in cancer. Second, aided with our SNP-IN tool, we performed a systematic edgetic profiling of population specific non-synonymous SNVs and interrogate their role in the human interactome. Our results demonstrated that a considerable amount of normal nsSNVs can cause disruptive impact to the interactome. We also showed that genes enriched with disruptive mutations associated with diverse functions and have implications in various diseases. Further analysis indicates that distinct gene edgetic profiles among major populations can help explain the population phenotypic variance. Finally, network analysis reveals phenotype-associated modules are enriched with disruptive mutations and the difference of the accumulated damage in such modules may suggest population-specific disease susceptibility. Lastly, we propose and develop a computational framework, Discovering most IMpacted SUbnetworks in interactoMe (DIMSUM), which enables the integration of genome-wide association studies (GWAS) and functional effects of mutations into the protein–protein interaction (PPI) network to improve disease module detection. Specifically, our approach incorporates and propagates the functional impact of non- synonymous single nucleotide polymorphisms (nsSNPs) on PPIs to implicate the genes that are most likely influenced by the disruptive mutations, and to identify the module with the greatest functional impact. Comparison against state-of-the-art seed-based module detection methods shows that our approach could yield modules that are biologically more relevant and have stronger association with the studied disease. With the advancement of next-generation sequencing technology that drives precision medicine, there is an increasing demand in understanding the changes in molecular mechanisms caused by the specific genetic variation. The current and future in-silico edgotyping tools present a cheap and fast solution to deal with the rapidly growing datasets of discovered mutations. Our work shows the feasibility of a large- scale in-silico edgetic study and revealing insights into the orchestrated play of mutations inside a complex PPI network. We also expect for our module detection method to become a part of the common toolbox for the disease module analysis, facilitating the discovery of new disease markers.
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Sancheti, Sandeep. "Active microstrip antenna self-detecting oscillator characterisation." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295427.
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Yang, Wei-Yuan, and 楊維元. "Applications of Polarization Modulator for Multi-service Signal Generation Module." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/wq8e97.
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碩士國立臺北科技大學
光電工程系研究所
102
In this work, we propose and experimentally demonstrated a multi-service signals generation module based on polarization modulator for RoF communication system. With the assistance of a polarization beam splitter, the pol-x and pol-y sidebands of optical polarization modulated multi-service signals can be separated colorlessly to achieve optical double/quadruple frequency. 3-band services are integrated and delivered simultaneously. After transmitting over 25 km single mode fiber, three band signals include OFDM and OOK are successfully achieved the qualities of radio-over-fiber communication.
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Ku, Chung-Chiang, and 谷中強. "Fabrication of Wideband Output Module with Automatic Level Control in the RF Signal Generator." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/81828299060621942988.
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碩士國立交通大學
電信研究所
83
The fabrication of wideband automatic level control(ALC) module with applications to RF signal generator is pre- sented in this thesis. The module has the capability of eliminating the fluctuation from the synthesizer,adjusting the output level precisely and generating low distortion amplitude modulation. The wideband design is under consid- eration when fabricates each sub-module.The module consists of the modulator,RF amplifier,power splitter,detector,loop filter and post attenuator.The features of PIN diodes, Schottky diodes and other passive components are charact- ized to achieve the broadband circuit design from 160 MHz to 1280MHz.In addition, the close-loop stability of the ALC and the linearization of the detector and modulator are also analyzed for further exploration.The output module with frequency range up to 1280 MHz,+13dBm maximum output ,stable and precise control of the output power level,50k Hz modulation bandwidth, less then 2% AM distortion under 30% AM index and less then 4% AM distortion under 70% AM index has been successfully fabricated.