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Koon, Suet Chui. « Integrated charge-control single-inductor dual-output switching converters / ». View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20KOON.
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Lee, Yen-Sung Michael. « Application of active inductors in high-speed I/O circuits ». Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2515.
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This thesis explores the use of active inductors as a compact alternative to the bulky passive spiral structures in high-speed I/O circuits. A newly proposed PMOS-based topology is introduced and used in active-inductor terminations. The 1st prototype design fabricated in a 90-nm CMOS process consists of an output driver using active-inductor terminations to provide channel equalization and output impedance matching. From measurement results, the use of active inductors in the termination, as compared to when the active inductor is disabled, increases the vertical eye opening in the receiver side by a factor of two and reduces the jitterp-p by 30% of the transmitted 10 Gb/s (2³¹-1) pseudo-random binary sequence pattern, over a 6-inch FR4 channel. An output impedance matching with S₂₂ less than -10 dB over a bandwidth of 20 GHz is achieved. The pair of active-inductor terminations occupies 17×25 µm² and has a low overhead power consumption of 0.8 mW. In the 2nd prototype design, a 4-stage output buffer with active-inductor loads is designed and implemented in a 65-nm CMOS process. Simulation results verify that when operating at 31.25 Gb/s, the output eye of the active-inductor load buffer compares favorably with that of the passive-inductor load buffer. For a similar eye-height and 78% less timing jitter the active-inductor load design’s speed (31.25 Gb/s) is 25% faster than the passive-resistor load design (25 Gb/s). The active-inductor load output buffer achieves comparable performance in terms of speed, power, and output swing with other reported designs using passive inductors. Its total area is 135×30 µm² (including three differential active inductors) which is comparable to the size of a single passive spiral inductor having a 0.5~1 nH inductance.
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Chirala, Mohan Krishna. « Passive and active circuits in cmos technology for rf, microwave and millimeter wave applications ». [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2069.
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Fonseca, Junior Paulo Nazareno Lagoia. « Indutores integrados passivos para aplicações em radio frequencia ». [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260576.
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Orientador: Luiz Carlos KretlyDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-12T09:54:12Z (GMT). No. of bitstreams: 1 FonsecaJunior_PauloNazarenoLagoia.pdf: 5632530 bytes, checksum: ea9f82363483a872a3effe7dbd527b5f (MD5) Previous issue date: 2008
Resumo: Este trabalho tem como finalidade a implementação de indutores integrados passivos baseados nas tecnologias de fabricação CMOS e BiCMOS. Os indutores são dispositivos fundamentais em aplicações de rádio freqüência e estão presentes na maioria dos circuitos de RF como amplificadores e osciladores. Os Indutores integrados passivos têm seus desempenhos degradados principalmente pelas perdas associadas ao metal e substrato. E apesar da existência de vários métodos de otimização, as foundries em geral, ainda oferecem um número reduzido de componentes, o que dificulta a escolha do melhor dispositivo para cada circuito. Sendo assim, a partir do projeto e implementação de indutores integrados o projetista é capaz de desenvolver novos dispositivos para cada aplicação. Este trabalho apresenta os resultados experimentais de indutores CMOS otimizados com a técnica de empilhamento para a redução de perdas ôhmicas e de PGS para a redução de perdas pelo substrato. Apresenta-se também indutores projetados na tecnologia BiCMOS com dupla camada de PGS; enterrada n+ e silício policristalino.
Abstract: This work aims the design and implementation of integrated passive inductors based on CMOS and BiCMOS processes. The inductors are essential devices in radio frequency applications and are used in many RF circuits such as amplifiers and oscillators. The inductors' performance is mainly limited by metal and substrate losses. Although various methods of improvement have been proposed, the foundries still offer a reduced number of components, making far more difficult to choose the best device for each circuit. In this way, from the design and implementation of integrated inductors, the designer is able to enhance and develop new devices for each application. This works presents the experimental results of inductors based on CMOS process. These inductors have been improved with two techniques; multilevel and PGS, the first one reduce the metal losses and the second to reduce the substrate losses. This work also shows inductors improved with double PGS based on BiCMOS process. The double PGS was designed with polysilicon and n+ buried layer.
Universidade Estadual de Campi
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Stegen, Sascha. « Development of an Integrated Magnetic System Assisted by Electromagnetic Simulation ». Thesis, Griffith University, 2012. http://hdl.handle.net/10072/365703.
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In DC/DC converter systems, power electronic circuits are reaching switching efficiencies close to 100 percent nowadays. Thus, most of the energy loss appears inside the passive magnetic circuit of the converter, which at the same time is the component that requires most space in the system. In order to battle this issue, research during the last century has been focused on planarization, hybridization and integration techniques with the goal to achieve higher efficiencies and decrease the profile and volume of the devices. In addition, higher frequencies have been applied to achieve a higher power density of the magnetic systems, but with the negative consequence of stronger parasitic effects such as proximity and skin effects inside the magnetic circuit.
This thesis deals with the development of an integrated magnetic system in a L-C-T (Inductor-Capacitor-Transformer) configuration, with the assistance of Finite Element Method (FEM) computer modeling, which is supportively used to accelerate the development process. Computational simulation method is used to indicate and address the physical issues, which cannot be identified with conventional measurement methods.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Yoon, Sangwoong. « LC-tank CMOS Voltage-Controlled Oscillators using High Quality Inductor Embedded in Advanced Packaging Technologies ». Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4887.
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This dissertation focuses on high-performance LC-tank CMOS VCO design at 2 GHz. The high-Q inductors are realized using wiring metal lines in advanced packages. Those inductors are used in the resonator of the VCO to achieve low phase noise, low power consumption, and a wide frequency tuning range.
In this dissertation, a fine-pitch ball-grid array (FBGA) package, a multichip module (MCM)-L package, and a wafer-level package (WLP) are incorporated to realize the high-Q inductor. The Q-factors of inductors embedded in packages are compared to those of inductors monolithically integrated on Si and GaAs substrates. All the inductors are modeled with a physical, simple, equivalent two-port model for the VCO design as well as for phase noise analysis. The losses in an LC-tank are analyzed from the phase noise perspective.
For the implementation of VCOs, the effects of the interconnection between the embedded inductor and the VCO circuit are investigated. The VCO using the on-chip inductors is designed as a reference. The performance of VCOs using the embedded inductor in a FBGA and a WLP is compared with that of a VCO using the on-chip inductor. The VCO design is optimized from the high-Q perspective to enhance performance. Through this optimization, less phase noise, lower power consumption, and a wider frequency tuning range are obtained simultaneously.
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Bolzan, Evandro. « Projeto de indutores ativos CMOS e a sua aplicação em VCO totalmente integrado ». reponame:Repositório Institucional da UFABC, 2015.
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Orientador: Prof. Dr. Carlos Eduardo CapovillaDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2015.
Este trabalho tem como escopo o projeto e implementação de indutores ativos integrados em tecnologia CMOS para operação em circuitos integrados de r'adio frequência. Tais sistemas demandam por indutores passivos integrados, sendo que estes geralmente apresentam baixa indutância, baixo fator de qualidade, e tamanhos relativamente grandes. Estes fatores são limitantes no projeto de circuitos integrados. Como alternativa, indutores ativos integrados têm sido propostos, com o uso de circuitos que emulam o efeito do indutor passivo convencional. Estes circuitos apresentam menor dimens¿ao, possibilidade de ajustes no valor da indut¿ancia, da frequ¿encia de opera¸c¿ao, do fator de qualidade, ao custo de consumo de pot¿encia DC e um relativo aumento no ru'ýdo total do sistema. Al'em de um profundo estudo, quatro topologias distintas de indutores ativos integrados foram abordadas e projetadas, em seguida foi projetado um VCO aplicando dois indutores ativos como ressonadores. Uma an'alise a n'ývel de projeto utilizando a t'ecnica de-embedding 'e aplicada no projeto de um indutor ativo. Os modelos dos componentes utilizados s¿ao baseados na biblioteca CMOS em alta frequ¿encia da foundry austr'ýaca AMS.
This study aimed to design and implement integrated active inductors in CMOS technology for operation in integrated radio frequency circuits. These systems demand for integrated passive inductors, and these usually have low inductance, low quality factor, and relatively large sizes. These factors are limiting in integrated circuit design. As an alternative integrated active inductors have been proposed, with the use of circuits that emulate the effect of conventional passive inductor. These circuits have smaller, the possibility for tuning the inductance value, the operation frequency, quality factor, at the cost of DC power consumption and a relative increase in total system noise. In addition to a thorough study, four different topologies ofintegrated active inductors were approached and designed, then was design a VCO applying two active inductors as resonators. An examination at the design level using the de-embedding technique is applied in the design of an active inductor. The models of the components used are based on CMOS library at high frequency of the Austrian foundry AMS.
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Cambero, Eduardo Vicente Valdés. « Aplicação de indutores ativos integrados CMOS em amplificadores de baixo ruído ». reponame:Repositório Institucional da UFABC, 2017.
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Szilàgyi, Làszlò, Guido Belfiore, Ronny Henker et Frank Ellinger. « 20–25 Gbit/s low-power inductor-less single-chip optical receiver and transmitter frontend in 28 nm digital CMOS ». Cambridge University Press, 2017. https://tud.qucosa.de/id/qucosa%3A70657.
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The design of an analog frontend including a receiver amplifier (RX) and laser diode driver (LDD) for optical communication system is described. The RX consists of a transimpedance amplifier, a limiting amplifier, and an output buffer (BUF). An offset compensation and common-mode control circuit is designed using switched-capacitor technique to save chip area, provides continuous reduction of the offset in the RX. Active-peaking methods are used to enhance the bandwidth and gain. The very low gate-oxide breakdown voltage of transistors in deep sub-micron technologies is overcome in the LDD by implementing a topology which has the amplifier placed in a floating well. It comprises a level shifter, a pre-amplifier, and the driver stage. The single-chip frontend, fabricated in a 28 nm bulk-digital complementary metal–oxide–semiconductor (CMOS) process has a total active area of 0.003 mm² , is among the smallest optical frontends. Without the BUF, which consumes 8 mW from a separate supply, the RX power consumption is 21 mW, while the LDD consumes 32 mW. Small-signal gain and bandwidth are measured. A photo diode and laser diode are bonded to the chip on a test-printed circuit board. Electro-optical measurements show an error-free detection with a bit error rate of 10⁻¹² at 20 Gbit/s of the RX at and a 25 Gbit/s transmission of the LDD.
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Danesh, Mina. « Monolithic inductors for silicon radio frequency integrated circuits ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0007/MQ45607.pdf.
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Crépel, Olivier. « Microscopie magnétique pour localisation de défaillance de circuits intégrés ». Caen, 2004. http://www.theses.fr/2004CAEN2060.
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Cette thèse est consacrée à l'étude et à l'évaluation d'une technique novatrice de localisation de défaillances des circuits intégrés , la microscopie magnétique. Cette technique consiste à mesurer l'induction magnétique générée par un circuit en fonctionnement afin d'obtenir une cartographie des densités de courants. Elle est absolument non destructive pour le circuit et permet de l'analyser sans avoir recours obligatoirement aux étapes de préparation et d'ouverture de boîtier. Ce manuscrit rappelle les principales sources de défaillances des circuits électroniques, puis présente sur un plan théorique les principes fondamentaux de la technique. Elle se consacre également à présenter les différents éléments utilisés dans un système de microscopie magnétique. Le sujet de thèse étant orienté vers l'applicatif, une importante partie de cette thèse est consacrée à l'analyse de circuits électroniques avec la microscopie magnétique.
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Heffernan, Laura K. « A fast, 3 MV Marx generator for megavolt oil switch testing and integrated Abramyan network design ». Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4270.
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Thesis (M.S.)--University of Missouri-Columbia, 2005.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (month day, year) Includes bibliographical references.
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Liu, Chun Kit. « Process development and characterization of inductors for organic substrates / ». View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20LIU.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 70-72). Also available in electronic version. Access restricted to campus users.
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Passos, Fábio Moreira de. « Modeling of integrated inductors for RF circuit design ». Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11113.
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Mohamed, Abdulatif Abdusalam. « Modelling and simulation of a cycloconverter induction motor drive ». Thesis, De Montfort University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391545.
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Maget, Judith. « Varactors and inductors for integrated RF circuits in standard MOS technologies ». [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967584388.
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Kavimandan, Mandar Dilip. « Integrated Inductors ». Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229637343.
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Bucossi, William Louis. « Process voltage temperature compensated on-chip CMOS active inductors for Wilkinson power dividing applications ». Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/bucossi/BucossiW0508.pdf.
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Few academic or industry feasibility studies have been published on the implementation of Active Inductors in a standard CMOS IC process as an alternative to the physically large and typically quite lossy spiral inductors. Development efforts at the simulation level have achieved only limited success in creating an Active Inductor topology that exhibits the quality and inductive tolerance necessary for the large-scale, high-volume production common to most IC components. This thesis focuses on manufacturing and characterizing the basic component circuitry necessary for the implementation of a lumped-element Wilkinson power divider using active inductors and develops a compensation scheme to control the parameters of merit in the active inductor across a useful process, voltage and temperature operating window. Hardware results presented reinforce the need to actively compensate the Active Inductor structure implemented in a 0.6um (AMIS C5) CMOS process. Simulation results presented show the benefits of a compensated Active Inductor incorporated into a typical RF network.
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Buurma, Andrew W. « Wideband lumped circuit models for integrated spiral inductors and capacitors ». The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1302624174.
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Kashani, Mohammad Mansour Riahi. « Formulation, development, and characterization of magnetic pastes and epoxies for thick film inductors ». Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10042006-143843/.
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Du, Sijun. « Energy-efficient interfaces for vibration energy harvesting ». Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/270359.
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Ultra low power wireless sensors and sensor systems are of increasing interest in a variety of applications ranging from structural health monitoring to industrial process control. Electrochemical batteries have thus far remained the primary energy sources for such systems despite the finite associated lifetimes imposed due to limitations associated with energy density. However, certain applications (such as implantable biomedical electronic devices and tire pressure sensors) require the operation of sensors and sensor systems over significant periods of time, where battery usage may be impractical and add cost due to the requirement for periodic re-charging and/or replacement. In order to address this challenge and extend the operational lifetime of wireless sensors, there has been an emerging research interest on harvesting ambient vibration energy. Vibration energy harvesting is a technology that generates electrical energy from ambient kinetic energy. Despite numerous research publications in this field over the past decade, low power density and variable ambient conditions remain as the key limitations of vibration energy harvesting. In terms of the piezoelectric transducers, the open-circuit voltage is usually low, which limits its power while extracted by a full-bridge rectifier. In terms of the interface circuits, most reported circuits are limited by the power efficiency, suitability to real-world vibration conditions and system volume due to large off-chip components required. The research reported in this thesis is focused on increasing power output of piezoelectric transducers and power extraction efficiency of interface circuits. There are five main chapters describing two new design topologies of piezoelectric transducers and three novel active interface circuits implemented with CMOS technology. In order to improve the power output of a piezoelectric transducer, a series connection configuration scheme is proposed, which splits the electrode of a harvester into multiple equal regions connected in series to inherently increase the open-circuit voltage generated by the harvester. This topology passively increases the rectified power while using a full-bridge rectifier. While most of piezoelectric transducers are designed with piezoelectric layers fully covered by electrodes, this thesis proposes a new electrode design topology, which maximizes the raw AC output power of a piezoelectric harvester by finding an optimal electrode coverage. In order to extract power from a piezoelectric harvester, three active interface circuits are proposed in this thesis. The first one improves the conventional SSHI (synchronized switch harvesting on inductor) by employing a startup circuitry to enable the system to start operating under much lower vibration excitation levels. The second one dynamically configures the connection of the two regions of a piezoelectric transducer to increase the operational range and output power under a variety of excitation levels. The third one is a novel SSH architecture which employs capacitors instead of inductors to perform synchronous voltage flip. This new architecture is named as SSHC (synchronized switch harvesting on capacitors) to distinguish from SSHI rectifiers and indicate its inductorless architecture.
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Chu, Chun San. « On-chip passive components for GaN-based RFIC/MMIC applications / ». View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20CHUC.
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Lin, Ray-Lee. « Piezoelectric Transformer Characterization and Application of Electronic Ballast ». Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29948.
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The characterization and modeling of piezoelectric transformers are studied and developed for use in electronic ballasts. By replacing conventional L-C resonant tanks with piezoelectric transformers, inductor-less piezoelectric transformer electronic ballasts have been developed for use in fluorescent lamps.
The piezoelectric transformer is a combination of piezoelectric actuators as the primary side and piezoelectric transducers as the secondary side, both of which work in longitudinal or transverse vibration mode. These actuators and transducers are both made of piezoelectric elements, which are composed of electrode plates and piezoelectric ceramic materials. Instead of the magnetic field coupling between the primary and secondary windings in a conventional magnetic core transformer, piezoelectric transformers transfer electrical energy via electro-mechanical coupling that occurs between the primary and secondary piezoelectric elements for isolation and step-up or step-down voltage conversion. Currently, there are three major types of piezoelectric transformers: Rosen, thickness vibration mode, and radial vibration mode, all three of which are used in DC/DC converters or in electronic ballasts for fluorescent lamps. Unlike the other two transformers, the characterization and modeling of the radial vibration mode piezoelectric transformer have not been studied and developed prior to this research work.
Based on the piezoelectric and wave equations, the physics-based equivalent circuit model of radial vibration mode piezoelectric transformers is derived and verified through characterization work.
Besides the major vibration mode, piezoelectric transformers have many spurious vibration modes in other frequency ranges. An improved multi-branch equivalent circuit is proposed, which more precisely characterizes radial vibration mode piezoelectric transformers to include other spurious vibration modes in wide frequency ranges, as compared with the characterizations achieved by prior circuits.
Since the equivalent circuit of piezoelectric transformers is identical to the conventional L-C resonant tank used in electronic ballasts for fluorescent lamps, piezoelectric transformers replace the conventional L-C resonant tank in order to reduce the amount and cost of electronic components for the electronic ballasts. With the inclusion of the radial vibration mode piezoelectric transformer, the design and implementation of inductor-less piezoelectric transformer electronic ballast applications have been completed.Ph. D.
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Anjos, Angélica dos. « Comparação de ferramentas para modelamento de indutores na tecnologia CMOS ». Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-27072007-145121/.
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Duas ferramentas para modelamento de indutores planares, retangulares e integrados e as equações analíticas implementadas em um software, foram estudadas e analisadas, para determinar qual é a mais apropriada, ou seja, aquela que fornece os resultados mais próximos de medidas experimentais, com menor custo, maior velocidade, etc. Indutores planares integrados apresentam limitações severas em seu uso. As duas principais são: o baixo valor do fator de qualidade, que limita o ganho e a banda nos amplificadores e filtros que os utilizam; e a dificuldade no seu modelamento e na determinação dos parâmetros que os caracterizam. Apesar das dificuldades no uso destes dispositivos, eles são aplicados em diversos sistemas, tais como transceptores que operam em rádio freqüências. Nestes sistemas, indutores são necessários e sua integração é essencial para se obter soluções completamente integradas. As ferramentas estudadas para o modelamento de indutores neste trabalho foram: ASITIC e SONNET. As equações analíticas foram implementadas no MATLAB. A comparação entre as ferramentas e as equações foi feita por meio de cinco indutores construídos e medidos. Os indutores foram fabricados em tecnologia CMOS de 0,35 µm com quatro camadas de metal. Para realizar a correta comparação entre os resultados simulados e as medidas elétricas, reduzindo ao máximo a interferência de elementos parasitas (inclusos pelos pads), os indutores foram inseridos em estruturas de teste. Estruturas de caracterização apropriadas foram também projetadas para permitir a eliminação do efeito das estruturas de teste sobre as medidas.Two modeling tools for integrated planar square inductors and one software implementing analytical relations, were studied and analyzed, to determine which is the most appropriate, that is, the tools that will supply the closest results to experimental measurements with, lower costs, higher speed, etc. Integrated planar inductors present severe limitations in their use. The two main limitations are: the low value of the quality factor, that affects the gain and the band of amplifiers and filters where they are used; and the difficulty in modeling and determining of their parameters. Inspire of the difficulties in the use of these devices, they are applied in many systems, such as transceivers that operate in radio frequency. In these systems, inductors are necessary and their integration is essential to obtain completely integrated solutions. In this work the studied tools for inductor modeling were: ASITIC and SONNET. The analytical relations were implementing in MATLAB. The comparisons between the tools were made through five implemented and measured inductors. The inductors were fabricated in a CMOS 0.35 µm technology with four metal layers. In order to carry out the correct comparison between the modeled results and the electric measurements, minimizing the interference of pad parasitic elements, the inductors were inserted within appropriate test structures. Characterization structures were also implemented to allow the elimination of the test structure effects on the measurements.
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Addou, Mohammed Adnan. « Filtrage actif intégré reconfigurable pour la téléphonie sans fil ». Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0123/document.
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Ce travail de thèse porte sur la conception de dispositifs filtrants accordables, c'est-à-dire pouvant commuter leurs caractéristiques d'un standard à un autre afin de réduire l’encombrement des chaines émission/réception d’un dispositif multistandard. Les filtres les plus utilisés actuellement sont des filtres acoustiques. En effet, ces filtres sont difficilement intégrables dans une technologie silicium et ils restent parmi les dispositifs passifs les plus encombrants du front-end RF. De plus, ils ne permettent pas d’avoir de bonnes performances en pertes d’insertion, en sélectivité et en accordabilité fréquentielle. De ce fait, des solutions alternatives sont à l’origine de ces travaux de thèse. Nous avons considéré tout d’abord un filtre actif qui a la possibilité de régler sa fréquence de résonnance, d’une part à la fréquence de résonnance du système Wifi et d’autre part, à la fréquence de résonnance du système Zigbee. Ensuite, une autre solution a été proposée dans le dernier chapitre qui consiste à réaliser une structure active filtrante bi-bande intégrée. Cette solution a pour avantage de récolter simultanément les données des systèmes opérant dans les deux bandes de fréquences visés. Les résultats obtenus des circuits réalisés sont validés par des simulations et de mesuresThis thesis concerns the design of tunable filter devices that can switch theirs characteristics from one standard to another in order to reduce the congestion of emission/reception chain of multi-standard systems. The most commonly used filters are acoustic filters. Indeed, these filters are difficult to be integrated in silicon technology and they remain one of the most bulky passive devices of the RF front-end. In addition, they don’t achieve good performance in insertion loss, frequency selectivity and tunability. Therefore, alternative solutions are at the origin of this thesis. An active filter is considered with the possibility of adjusting the resonance frequency: the resonant frequency of the Wifi system and the resonance frequency of the Zigbee system. Moreover, another solution is proposed in the last chapter, which consists to achieve a dual band structure of integrated active filter. This solution has the advantage to simultaneously collect data provided from the operating systems located in the two specified frequencies bands. Simulations and measurements validate the results of the realized circuits
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Karpe, Charvak (Charvak P. ). « RF signal inductors in iUHD for voltage controlled oscillators in configurable RF integrated circuits ». Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41604.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 71-74).
The miniaturization of radio frequency wireless communications circuitry has resulted in a need for smaller inductors. This thesis presents designs of spiral inductors to be fabricated in Draper Laboratory's integrated Ultra High Density packaging process. The inductor designs are simulated using Ansoft's High Frequency Structure Simulator and the resulting inductor performance parameters are used to design a voltage controlled oscillator (VCO) meeting 802.1 lb wireless specifications. The design demonstrates the importance of inductor quality factor in minimizing phase noise. It is also shown that further improvements can be made to RF integrated circuits by increasing the maximum load impedance seen by the VCO.
by Charvak Karpe.
M.Eng.
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Arkan, Muslum. « Stator fault diagnosis in induction motors ». Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310244.
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Mombo, Boussougou Yves Constant. « Intérêt et faisabilité des interconnexions radiofréquences : caractérisation électromagnétique du canal et études des modes d'accès ». Brest, 2011. http://www.theses.fr/2011BRES2021.
Texte intégralRésumé :
Pour pallier les limitations des interconnexions classiques (puissance dissipée, débit), engendrées par l’augmentation des performances des systèmes, plusieurs solutions sont envisagées notamment dans l’ITRS. Citons notamment les interconnexions optiques, les interconnexions 3D et les interconnexions radiofréquences. Dans ce travail nous nous sommes intéressés aux interconnexions radiofréquences, utilisant des moyens de communication radiofréquence, offrant plusieurs avantages notamment en tenue de reconfigurabilité, de débit et de coût. Le but de ce travail est d’estimer l’intérêt et la faisabilité de cette approche à travers la caractérisation de différents canaux RF, et de l’étude de différents modes d’accès. Pour valider ce concept par la transmission simultanée de plusieurs bits d’information à l’aide d’une interconnexion RF, nous associons des canaux de transmission réalistes avec deux types de techniques d’accès multiple différents. Ainsi, pour des communications intra-puces, nous proposons l’utilisation d’un accès FDMA associé à un canal avec couplage capacitif. Malgré des résultats prometteurs, la complexité et la surface des circuits à réaliser semblent encore trop importantes pour valider cette approche pour des communications. En ce qui concerne le cas des communications inter-puces sur carte PCB, nous présentons un exemple utilisant une technique CDMA et un canal RF avec des transitions microruban-fente. Pour ce type d’application les résultats obtenus nous permettent de valider la topologie retenue et même de proposer l’architecture d’un circuit d’interface facilitant ce type de communicationsTo overcome the limitations of conventional interconnects (power loss, data rate), caused by the increase in system performance, several solutions are being considered including in the ITRS. These include optical interconnects, 3D interconnects and radio frequency interconnects. In this work we focused on radio frequency interconnects, using radio frequency communication channels, providing several advantages especially in terms of reconfigurability, data rate and cost. The purpose of this study was to assess die desirability and feasibility of this approach through the characterization of different RF channels, and the study of different modes of access. To validate this concept by the simultaneous transmission of several bits of information using an RF interconnect, we combine realistic transmission channels with two types of different multiple access techniques. Thus, for intra-chip communications, we propose the use of FDMA access to a channel associated with capacitive coupling. Despite promising results, the complexity and the surface of the circuit to achieve seem ton important to validate this approach to communications. Regarding tire case of inter-chip communications on board PCB, we present an example using a CDMA and a RF channel with microstrip-slot transitions. For this application tire results allow us to validate die topology chosen to offer and even die architecture of an interface circuit to facilitate such communications
29
Robinson, Michael J. « Finite element calculation of equivalent circuit parameters for induction motors ». Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/8003.
Texte intégral
30
Arkeholt, Simon. « Induction in Printed Circuit Boards using Magnetic Near-Field Transmissions ». Thesis, Linköpings universitet, Teoretisk Fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148788.
Texte intégralRésumé :
In 1865 Maxwell outlined the theoretical framework for electromagnetic field propagation. Since then many important developments have been made in the field, with an emphasis on systems using high frequencies for long-range interactions. It was not until recent years that applications based on short-range inductive coupling demonstrated the advantages of using low frequency transmissions with magnetic fields to transfer power and information. This thesis investigates magnetic transmissions in the near-field and the possibility of producing induced voltages in printed circuit boards. A near-field magnetic induction system is designed to generate a magnetic flux in the very low frequency region, and used experimentally to evaluate circuit board induction in several interesting environments. The resulting voltages are measured with digital signal processing techniques, using Welch’s method to estimate the spectrum of the received voltage signal. The results show that the amount of induced voltage is proportional to the inverse cube of the transmission distance, and that the system is able to achieve a maximum induced voltage of 65 \micro V at a distance of 2.5 m and under line-of-sight conditions. It is also concluded that conductive obstructions, electromagnetic shielding and background noise all have a large impact on the obtained voltage, either cancelling the signal or causing it to fluctuate.
31
Aleksandar, Pajkanović. « Пројектовање и карактеризација индуктора и нискошумног појачавача у технологији монолитних интегрисаних кола за широкопојасне примене ». Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107143&source=NDLTD&language=en.
Texte intégralRésumé :
Пасивна индуктивна компонента и нискошумни појачавач у технологијимонолитних интегрисаних кола за широкопојасне примјене пројектованису, фабриковани и карактерисани. Приликом пројектовања индуктораизабрана је топологија меандар, а осим софтверских алата запројектовање интегрисаних кола, кориштен је и симулаторелектромагнетског поља. Осим карактеризације основних параметара,пажња је посвећена и анализи процесних и температурских варијација.Спроведена је механичка карактеризација материјала од којег се састојизаштитни слој фабрикованог интегрисаног кола. Нискошумни појачавачпројектован је као први степен пријемника широкопојасне технологије, акарактеризацијом је потврђена успјешност поступка.Pasivna induktivna komponenta i niskošumni pojačavač u tehnologijimonolitnih integrisanih kola za širokopojasne primjene projektovanisu, fabrikovani i karakterisani. Prilikom projektovanja induktoraizabrana je topologija meandar, a osim softverskih alata zaprojektovanje integrisanih kola, korišten je i simulatorelektromagnetskog polja. Osim karakterizacije osnovnih parametara,pažnja je posvećena i analizi procesnih i temperaturskih varijacija.Sprovedena je mehanička karakterizacija materijala od kojeg se sastojizaštitni sloj fabrikovanog integrisanog kola. Niskošumni pojačavačprojektovan je kao prvi stepen prijemnika širokopojasne tehnologije, akarakterizacijom je potvrđena uspješnost postupka.
A passive inductive component and a low-noise amplifier are designed,fabricated in standard monolithic CMOS technology and characterized, bothintended for wideband operation. For the design of the inductor, meandertopology is chosen. Along with the integrated circuit design tools,electromagnetic field simulator is used. Besides the standard parametercharacterization, special attention is dedicated to the analysis of process andtemperature variations. Furthermore, mechanical characterization of thematerial that comprises the protection layer has been undertaken. Low-noiseamplifier is designed as the first stage of an ultra wideband receiver and theresults show that the circuit is successfully designed.
32
陳卓雄。 et Chuk-hung Chan. « Design and evaluation of active power factor correction circuit operation in discontinuous inductor current mode ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31220344.
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Chan, Chuk-hung. « Design and evaluation of active power factor correction circuit operation in discontinuous inductor current mode / ». Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2062315X.
Texte intégral
34
Oliveira, Ãtila GirÃo de. « Neural classifier aplied in stator winding inter-turn short circuit in three-phase induction motors driven by frequency converter ». Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12285.
Texte intégralRésumé :
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorThis dissertation reports applications of artificial neural networks to detect stator winding interturn fault of three phase induction motor drived by frequency inverter. The artificial neural networks, like Simple and Multilayer Perceptron, served as off-line classifiers to short-circuit fault condition or healthy condition. In the training of Multilayer Perceptron, two different algorithms are used: the error back-propagation, which is a classic algorithm, and the extreme learning machine, as a relative new alternative for the classic back-propagation. The new one is more worthwhile because of its implementation easiness and higher speed of computation. The database used on the training and validation of the networks is created from an experimental setting, therefore it is composed by true data. The attributes used as failuresâ indicators are selected from certain frequencies of the spectrum, based on some theories of current signature analysis. In the second instance, the technique of principal components analysis is employed. The results obtained for the designed classifiers are shown, and some considerations are made on their use in real time embedded applications, which is the most important projection for future researches.
Este trabalho deriva da aplicaÃÃo de redes neurais artificiais para a detecÃÃo de curto-circuito entre espiras em motor de induÃÃo trifÃsico, acionado por inversor de frequÃncia. As redes neurais artificiais, do tipo Perceptron Simples e Multicamadas, sÃo usadas para detectar falhas de curto-circuito no bobinamento estatÃrico de motores de induÃÃo trifÃsicos de forma off-line. Para treinamento do Perceptron Multicamadas sÃo usados dois algoritmos distintos: o error back-propagation, que figura como o algoritmo clÃssico na literatura especializada, e o extreme learning machine, que à uma alternativa, relativamente recente, ao algoritmo clÃssico. Este algoritmo à uma opÃÃo atraente para o desenvolvimento rÃpido de classificadores. O banco de dados usado para treinamento e validaÃÃo das redes à obtido a partir de experimentaÃÃo laboratorial, portanto composto de dados reais. Os atributos utilizados para a detecÃÃo da falha sÃo componentes de frequÃncia do espectro harmÃnico da corrente estatÃrica do motor. O critÃrio de escolha destas componentes, a priori, à fundamentado em resultados de investigaÃÃes prÃvias da assinatura de corrente e, em segunda instÃncia, à aplicada a tÃcnica de anÃlise de componentes principais. SÃo apresentados os resultados obtidospelos classificadores projetados, e feitas algumas consideraÃÃes quanto à utilizaÃÃo destes em aplicaÃÃo embarcada e em tempo real, que à a principal projeÃÃo de futuros trabalhos a partir do atual.
35
Larde, Christophe. « Étude expérimentale du comportement des circuits intégrés logiques soumis à des perturbations électromagnétiques ». Lille 1, 1991. http://www.theses.fr/1991LIL10121.
Texte intégralRésumé :
L'usage de plus en plus fréquent des logiques bas niveau expose certaines fonctions à un risque électromagnétique important. On comprend alors l'intérêt qu'il y a à réduire ces risques en agissant sur la sensibilité électromagnétique des équipements électroniques. C'est à ce problème qu'est consacrée notre thèse, où nous cherchons à reconnaître à travers les différentes familles technologiques de composants logiques actifs des comportements singuliers vis-à-vis des agressions électromagnétiques. Dans le premier chapitre nous mettons en place deux dispositifs d'injection de perturbation électromagnétique de type impulsionnel, ceux-ci trouvent leur justification dans la modélisation du phénomène de couplage. Dans les deux chapitres suivants nous exploitons les deux dispositifs précédents en les appliquant aux ports d'accès de circuits NAND de différentes familles technologiques. Les essais pratiqués montrent le rôle important joué par la nature non linéaire des impédances mises en jeu lors de l'agression électromagnétique des circuits. Enfin dans le quatrième chapitre nous présentons les différentes possibilités offertes par un logiciel développé au laboratoire, qui permet de simuler le résultat de l'induction électromagnétique produit sur des pistes de circuits imprimés à des circuits intégrés
36
Dahlmann, Gerald Wolfgang. « Microfabrication of monolithic inductors for microwave integrated circuits using a self-assembly technique based on surface tension ». Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397705.
Texte intégral
37
Bunch, Ryan Lee. « A Fully Monolithic 2.5 GHz LC Voltage Controlled Oscillator in 0.35 um CMOS Technology ». Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32287.
Texte intégralRésumé :
The explosive growth in wireless communications has led to an increased
demand for wireless products that are cheaper, smaller, and lower
power. Recently there has been an increased interest in using CMOS, a
traditional digital and low frequency analog IC technology, to implement
RF components such as mixers, voltage controlled oscillators (VCOs), and
low noise amplifiers (LNAs). Future mass-market RF links, such as
BlueTooth, will require the potentially low-cost single-chip solutions
that CMOS can provide. In order for such single-chip solutions to be
realized, RF circuits must be designed that can operate in the presence
of noisy digital circuitry. The voltage controlled oscillator (VCO), an
important building block for RF systems, is particularly sensitive when
exposed to an electrically noisy environment. In addition, CMOS
implementations of VCOs have been hampered by the lack of high-quality
integrated inductors.
This thesis focuses on the design of a fully integrated 2.5 GHz LC CMOS
VCO. The circuit is intended as a vehicle for future mixed RF/digital
noise characterization. The circuit was implemented in a 0.35 um single
poly, 4 metal, 3.3 V, CMOS process available through MOSIS. The
oscillator uses a complementary negative transconductance topology.
This oscillator circuit is analyzed as a negative-resistance
oscillator. Monolithic inductors are designed using full-wave
electromagnetic field solver software. The design of an
"inversion-mode" MOS (I-MOS) tuning varactor is presented, along with a
discussion of the effects of varactor nonlinearity on VCO performance.
I-MOS varactors are shown to have substantially improved tuning range
(and tuning curve linearity) over conventional MOS varactors. Practical
issues pertaining to CMOS VCO circuit design, layout, and testing are
also discussed. The characterization of the VCO and the integrated
passives is presented. The VCO achieves a best-case phase noise of
-106.7 dBc/Hz at 100 kHz offset from a center frequency of 2.73 GHz. The
tuning range is 425 MHz (17%). The circuit consumes 9 mA from a 3.3 V
supply. This represents excellent performance for CMOS oscillator
designs reported at this frequency. Finally, several recommendations for
improvements in oscillator performance and characterization are
discussed.Master of Science
38
Ku, Ahamad Ku Nurul Edhura. « Investigation of a complex conjugate matching circuit for a piezoelectric energy harvester ». Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/investigation-of-a-complex-conjugate-matching-circuit-for-a-piezoelectric-energy-harvester(20d865b2-d2b3-4ef5-b64d-72d5fcf3164d).html.
Texte intégralRésumé :
The work described in this thesis is aimed at developing a novel piezoelectric cantilever energy harvesting circuit, so that more energy can be obtained from a particular piezoelectric harvester than is possible using conventional circuits. The main focus of the work was to design, build and test a proof of principle system, and not a commercial version, so as to determine any limitations to the circuit. The circuit functions by cancelling the capacitive output reactance of the piezoelectric harvester with a simulated inductance, and is based on an idea proposed by Qi in 2011. Although Qi's approach demonstrated that the circuit could function, the system proved too lossy, and so a less lossy version is attempted here. Experimental and software simulations are provided to verify the theoretical predictions. A prototype amplified inductor circuit was simulated and tested. From the simulation results, although harmonic current losses were found in the circuit, it was found that the circuit should produce an amplified effective inductance and a maximum output power of 165mW. The effective inductance is derived from the voltage across the 2H inductor, and this voltage is amplified and applied to the circuit via an inverter, to provide an extra simulated inductance, so that the overall inductance can be resonated with the piezoelectric harvester output capacitance. Hence the capacitive impedance of the harvester is nearly cancelled. The study and analysis of the amplified inductor circuit was carried out for a single cantilever harvester. Both open loop and closed loop testing of the system were carried out. The open loop test showed that the concept should function as predicted. The purpose of the closed loop test was to make the system automatically adjust for different resonance frequencies. The circuit was tested at 52Vpp inverter output voltage, and demonstrated a harvested power of 145.5mW. Experimental results show that the harvester output power is boosted from 8.8mW as per the manufacturer data sheet to 145.5mW (16.5 times). This is approximately double the power available using circuits described in the literature.
39
Roy, Tonmoy. « Reachability Analysis of RTL Circuits Using k-Induction Bounded Model Checking and Test Vector Compaction ». Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78801.
Texte intégralRésumé :
In the first half of this thesis, a novel approach for k-induction bounded model checking using
signal domain constraints and property partitioning for proving unreachability of
branches in Verilog RTL code is presented. To do this, it approach
uses program slicing with
respect to the variables of the property under test to generate small-sized
SMT formulas that describe the change of variable values between
consecutive cycles. Variable substitution is then used on these
variables to generate the formula for the subsequent cycles without
traversing the abstract syntax tree of the entire design.
To reduce the approximation on the induction step, an addition of
signal domain constraints is proposed. Moreover, we present the technique for splitting up the
property in question to get a better model of the system.
The later half of the thesis is concerned with presenting a technique
for doing sequential vector compaction on test set generated during
simulation based ATPG. Starting with a compaction framework for storing
metadata and about the test vectors during generation, this work
presented to methods for findind the solution of this compaction problem.
The first of these two methods generate the optimum solution by converting
the problem appropriate for an optimization solver. The latter method
utilizes a heuristics based approach for solving the same problem which
generates a comparable but sub-optimal solution while having
magnitudes better time and computational efficiency.Master of Science
40
Razzak, M. A., Y. Suzuki, S. Takamura et Y. Uesugi. « High Pressure Radio Frequency Induction Thermal Plasma Generation Using T-LCL Immittance Circuit ». IEEE, 2004. http://hdl.handle.net/2237/7108.
Texte intégral
41
Babu, Hareesh. « Finite-element analysis of an induction motor with inter-turn short-circuit faults ». Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290082.
Texte intégralRésumé :
Stator inter-turn short circuit (ITSC) faults are one of the common sources for induction machine failure affecting their reliable operation. In this thesis, a finite element (FE) model is developed to study the ITSC fault. The FE model is developed for a prototype induction machine that has the potential to emulate an ITSC fault in the stator. With the developed FE model of the prototype machine, a simulation study is performed to understand the behaviour of various electrical and magnetic quantities in time- and frequency-domain. The investigated quantities are potentially good signatures of the stator winding faults and they are therefore suitable to use in a condition monitoring system. The prototype machine with ITSC faults has been tested in an experimental setup and the results are compared to the simulation and also to analytical results. For the fault current it was found a good agreement between analytical results, FE simulations and experimental results. Moreover, the FE simulation results of the negative-sequence stator current amplitude present a minor mismatch with the analytical and experimental results. The reason for this mismatch is due to an inaccurate knowledge of the prototype machine geometrical parameters.Kortslutning mellan varven i en asynkronmotors statorlindning (ITSC) är en av de vanligaste källorna för fel som påverkar dess drifttillförlitlighet. I detta examensarbete utvecklas en finit-element (FE) modell för att studera ITSC- fel. FE-modellen är utvecklad för en asynkronmotorprototyp som kan emulera ITSC-fel. Med den utvecklade modellen utförs en simuleringsstudie för att förstå beteendet hos olika elektriska och magnetiska egenskaper både i tids- och frekvensdomän. Dessa egenskaper är goda indikatorer av statorlindningsfel och kan därför med fördel användas i ett tillståndsövervakningssystem. Prototypmaskinen har testats experimentellt och de erhållna resultaten jämförs med FE-simuleringen och analysresultaten. Det analytiska resultatet, FEM- simuleringarna och den experimentella utvärderingen uppvisade god överrensstämmelse vad gäller felströmmen. Dock finns det en mindre avvikelse när det gäller amplituden hos statorströmmens negativa fasföljd. Orsaken till denna avvikelse är att prototypmaskinens geometri inte är helt känd.
42
Zheng, Chun-Yi, et 鄭椿億. « Design of Active Inductor Microwave Integrated Circuits ». Thesis, 2003. http://ndltd.ncl.edu.tw/handle/xy44u4.
Texte intégralRésumé :
碩士逢甲大學
電子工程所
91
In the thesis, the novel wide-band high Q-value active inductor circuits are realized by MESFETs, HBTs, and MOSFETs. The active inductor has equivalent constant series negative resistance with equivalent loss of active inductor. Therefore, the equivalent loss of the active inductor keeps near constant in wide-band frequencies. The active inductors with high inductance and high Q values are realized. The MOSFET active inductor can achieve an inductance value of 51.18 nH and need only 2.4-V supply voltage. The Q-value of the MOSFET active inductor reaches 76.0. The wide-band high Q-value HBT active inductors are realized by new circuit architectures. The inductance of the HBT active inductor can achieve 11.58 nH. An HBT wide-band amplifier operating from 3.8 to 6.2 GHz is realized by employing the HBT wide-band high Q-value active inductor. The amplifier operating at 4.5 GHz demonstrates a gain of 11.8 dB, an input return loss of —33.7 dB, and an output return loss of —11.1 dB. The HBT wide-band amplifier demonstrates high gain and low return loss for a wide frequency band from 3.8 to 6.2 GHz. A high-Q MOSFET active band-stop filter is also realized by the active inductor circuit topology. The S21 of the MOSFET active band-stop filter employed the active inductor can achieve -18.6 dB at a center frequency of 3.1 GHz. The Q-value is 10.3.
43
JARWAL, VIKASH. « AN INVESTIGATING ON CDBA BASED CONTINOUS TIME CIRCUITS ». Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15114.
Texte intégralRésumé :
Over the year of time, the evolution of modern application of signal processing has
followed the trends of so called current mode, when signals, representing the information being
processed, are in the form of current. In contrast to the conventional mode which utilized electric
voltage, the current mode circuit can exhibit higher bandwidth, better signal linearity, higher
slew rate and lower power consumption. Since they are designed for lower voltage swings,
smaller supply voltage can be used. The current differencing buffered (CDBA) amplifier can
operate in both current mode and voltage mode, which provides flexibility.
This project discusses implementation of lossless grounded negative inductor circuits
(and application thereof), and oscillator circuit, using single CDBA. CDBA is designed using
AD844 IC.
44
Lee, Ren-Jie, et 李仁傑. « Researches on Monolithic Radio Frequency Active Inductor Integrated Circuits ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/61596791894376693213.
Texte intégralRésumé :
碩士逢甲大學
電子工程學系
88
The purpose of this thesis is to implement active inductor integrated circuits with a very high quality value and a tunable inductance. In general, spiral inductors occupy a quite large space and increase the fabrication costs. Besides, the Q-value of the spiral inductor is typically lower than 10. Such active inductor can offset these disadvantages and be extensively used in the applications for basic module of front-end transceiver in wireless communication system, such as LNA (Low Noise Amplifier), VCO (Voltage Controlled Oscillator), BPF (Band Pass Filter) … etc. In this study, three kinds of microwave devices including MESFETs, HBTs and HEMTs were adopted for comparison in designing RF active inductors. The circuit performances and the limitations for practical implementation will be discussed in details based on a Gyrator configuration. In order to achieve a high Q active inductor with large inductance and less DC power consumption, modified circuit topologies were proposed with following achievements. First, for the purpose of tuning inductance, the transistor gyrator was introduced with a feedback resistor. The characteristics of such simple circuit were analyzed completely, and the effects of device parameters and feedback resistance will be demonstrated. According to the measurement, the optimal Q value can be as high as 7.5 with an inductance of 4 nH. Second, a circuit based on Hara''s work was modified by a method of negative-resistance compensation. In order to implement a high-Q, tunable active inductor with low DC power dissipation, HBTs were investigated to estimate the possible performances. In accordance with the simulation results, it is found that at 2.4 GHz the inductance variation within 2.9-10 nH can be obtain, and the optimum Q value is always above 20. The DC power consumption is approximately as low as 2.8 mW. Finally, the compensation methods by a feedback resistor and a negative resistor were adopted in the circuit at the same time. Simply using this resistance-modulating technique, the performances of active inductor, which was implemented by various microwave transistors, can easily be improved. For the purpose of promoting operating frequency, such circuit was realized by HEMTs. According to simulation results, the optimal Q value can be as high as 110 with an inductance of 3 nH at 5 GHz.
45
Tai, Chen, et 陳泰江. « A Simple Micro - solenoid Type Inductor for Integrated Circuits ». Thesis, 1998. http://ndltd.ncl.edu.tw/handle/76001952909498466690.
Texte intégralRésumé :
碩士國立中山大學
光電工程學研究所
86
The objective of this work is to develop a simple processingtechnology to construct a solenoid type micro - inductor forVLSI integration. The resonant frequency of device is designedto operate at microwave range. Because the micro - inductor was fabrication on the silicon substrate. So a polyimide layer witha thickness of 2.1um was used to decouple the electrical couplingbetween the device and silicon substrate,and in turn to improvethe Q factor. The micro - solenoid type inductor was fabricated using a magn-etion sputter system,photo - lithography,ECR system and wet etch-ing technology. We used Fe-Ni-Mo as the core to increase the ind-uctance of the device. The intrinsic characteristics of micro - solenoid inductor was measured with a HP85107 Network analyzer. The maximum inductance and Q - factor of the inductor are 6nH at100MHz and 3 at 1.2GHz,respectively.
46
Lai, Chih-Hao, et 賴志豪. « A 900MHz CMOS RF Front-End Circuits using Active Inductor ». Thesis, 1998. http://ndltd.ncl.edu.tw/handle/11431458765721406292.
Texte intégralRésumé :
碩士國立臺灣大學
電機工程學系研究所
86
Active inductors have the advantages of smaller area, easier implementation, tunable and stabler center frequency over spiral inductors or bonding wires for the LC-tank in RF circuits. This paper presents a 900MHz CMOS RF front-end circuit composing of a wide-center-frequency-tuning-range LNA using active inductor and Gilbert type downconversion mixer. The front-end circuit can output 10MHz 28mV IF band signal with a RF input 830MHz 10uV sinusoidal signal and two LO input 840MHz 500mV sinusoidal signals. The LNA has a 39.7dB gain with 829.3MHz center frequency, and the center frequency tuning range is from 700MHz to 880MHz where the gain is all above 20dB. The noise figure of LNA is 1.82dB, and P1dB is -25.8dBm.
47
Jia-SianChen et 陳家賢. « Piezoelectric Energy Harvester Interface Circuits Using Multi-Switched Inductor Technique ». Thesis, 2015. http://ndltd.ncl.edu.tw/handle/41199454740392558017.
Texte intégralRésumé :
碩士國立成功大學
電機工程學系
103
In this thesis, TSMC 0.18-μm 1P6M process is applied to implement the design of the energy harvesting interface circuits. A multi-switched inductor technology is proposed to improve the conversion efficiency of the interface circuit power and the harvesting output power. The loss of the traditional switching inductor can be improved by the multi-switching control technologies to lower the maximal inductor current. Moreover, a self-startup is included to fulfill battery-free piezoelectric systems, so the energy harvesting technologies can be applied more widely. The overall energy harvesting interface circuit consists of a negative voltage conversion (NVC) circuit, a switching inductance circuit, a startup circuit, and a multiple switching control logic circuit. The measured results of the proposed piezoelectric interface circuits show that the energy harvester can scavenge power of 100 μW to 1 mW. The loss of the traditional switching inductor can be improved by the multi-switching control technologies. The peak conversion efficiency can be achieved to 86.3%. The overall chip area is 0.672 mm × 0.563 mm.
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GARG, KAMINI. « MODIFIED CFOA AND ITS APPLICATION FOR THE SIMULATION OF INDUCTOR, FILTER AND INVERSE FILTER ». Thesis, 2012. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14126.
Texte intégralRésumé :
The recent trend in electronics has been towards reducing the size of circuits, a trend which
culminated in the development of integrated circuits, but it has been proven impractical to
achieve a comparable reduction in the size of inductors because of the relation between the
size of inductor and the quality factor. Also inductors are seldom used at low frequencies
because at very low frequency the size and weight of inductors become exceedingly large and
quality factor becomes very low. Fortunately, active circuits can sometimes synthesize the
equivalent of an inductor with high quality factor.
In this dissertation, we have presented a modified current feedback operational
amplifier (MCFOA), which is more suitable for realizing simulated inductors and active
filters. New grounded inductor and floating inductor have been simulated using a minimum
number of passive components based on one or two modified current feedback operational
amplifiers (MCFOAs) and the result is validated with the implementation of RL high pass
filter.
To show the flexibility of the proposed MCFOA, a single input three output (SITO)
voltage mode filter and three input single output (TISO) voltage mode filters employing a
single MCFOA have been simulated using the PSPICE program.
In communication, control and instrumentation systems an electrical signal may get
altered by many linear or nonlinear transformation caused by the signal processors or
transmission system. To recover these distortions of the signal, a system is required that has
inverse transfer characteristics of the original system. Inverse filter can correct these
distortions because it has frequency response, which is the reciprocal of the frequency
response of the system that caused the, distortion.
In this dissertation, inverse filters have been designed using both the Modified current
feedback operational amplifier (MCFOA) and standard AD844 CFOA. The workability of
the proposed inverse filters is demonstrated by PSPICE simulations.
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Sajeeda. « System for wireless, automated and continuous monitoring of resonant frequency of an inductor - capacitor circuit ». 2004. http://etd.lib.montana.edu/etd/2004/sajeeda/Sajeeda04.pdf.
Texte intégral
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Wang, Tao. « RF MEMS Circuit and Inductor ». 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1907200411022300.
Texte intégral