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Dissertations / Theses on the topic 'Analog samples'

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Published: 8 June 2024

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Wiese, Jessica A. "Determination of benzotriazole and analog compounds by liquid chromatography-mass spectrometry in surface runoff water samples from Wilmington Air Park." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1576573860964496.

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Raahemi, Bijan. "Analysis of analog sampled data circuits." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21384.pdf.

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Peng, Michael Yung. "System demonstration of an optically-sampled, wavelength-demultiplexed photonic analog-to-digital converter." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68507.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 84-86).
The performance of electronic analog-to-digital converters (ADCs) at high sampling rates is fundamentally limited by the timing jitter of electronic clocks. To circumvent this limitation, one method is to exploit the orders-of-magnitude lower timing jitter of mode-locked lasers and implement optical sampling as a front-end for electronic ADCs. The optical-sampling, wavelength-demultiplexing approach to A/D conversion, which is explored in this thesis, offers key benefits such as ease of scalability to higher aggregate sampling rates via passive wavelength-division demultiplexing (WDM) filters and potential for full integration via silicon photonics platform for chip-scale signal processing applications. This thesis will first cover the design issues for each stage in the optically-sampled, wavelength-demultiplexed photonic ADC architecture, followed by experimental results from two system demonstrations. Digitization of a 41-GHz signal with 7.0 effective bits at a sampling rate of 2 GSa/s was demonstrated with a discrete-component photonic ADC, which corresponds to 15 fs of jitter, a 4-5 times improvement over state-of-the-art electronic ADCs. On the way towards an integrated photonic ADC, a silicon chip with core photonic components was fabricated and used to digitize a 10-GHz signal with 3.5 effective bits. Drop-port transmission measurements of an integrated 20-channel WDM filter bank are included to show potential for high sampling rate operation with 10 effective bits.
by Michael Yung Peng.
S.M.

Chin, Henry. "Linear electro-optic conversion of sampled signals for a photonic-assisted analog-to-digital converter /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Battersby, Nicholas Charles. "Switched-current techniques for analogue sampled-data signal processing." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394048.

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Harbour, Kenton Dean. "A data acquisition system with switched capacitor sample-and-hold." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/15269.

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Rivet, Francois. "Contribution à l'étude et à la réalisation d'un frontal radiofréquence analogique en temps discrets pour la radio-logicielle intégrale." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00412242.

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Le concept de Radio Logicielle propose d'intégrer en un seul circuit un émetteur / récepteur RF capable d'émettre et de recevoir n'importe quel signal RF. Cependant, ce concept doit affronter des contraintes technologiques dans le cas des terminaux mobiles. La contrainte principale est la consommation de puissance du terminal. En effet, la conversion analogique numérique qui est la clé de ce système en est aussi le principal verrou technique. Cette thèse présente une architecture de récepteur en rupture avec les architectures classiques afin de surmonter le problème de la conversion analogique numérique. Il s'agit d'un processeur analogique de traitement du signal dédié à la Radio Logicielle intégrale dans la gamme de fréquence 0 à 5GHz. Sa conception et les mesures d'un prototype sont présentées.

BONIFAZI, MAURIZIO. "Analog circuits design for cellular neural network." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2008. http://hdl.handle.net/2108/705.

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Il paradigma delle Reti Neurali Artificiali (ANN) consiste nell’applicazione del modello neurale “biologico” per la risoluzione di problemi che spesso sono troppo complessi per un’architettura di Von Neumann. La letteratura offre differenti approcci per l’implementazione di ANN. Qualche implementazione è di tipo software, altre sono soluzioni circuitali come circuiti digitali full-custom o FPGA (Field Programmable Gate Array), come pure circuiti analogici, e il tipo di implementazione di certo dipende dal tempo di esecuzione adeguato al tipo di applicazione. Questa tesi riguarda la progettazione di nuovi circuiti analogici adattati per le Reti Neurali. In particolare, saranno utilizzate le Reti Neurali Cellulari (CNN) proposte nel 1981 dal Prof. L.O.Chua (University of California – Berkeley). Il “Laboratorio di Circuiti” dell’Università di Roma “Tor Vergata” ha progettato e realizzato alcuni chip analogici dedicati a questo tipo di Reti Neurali. Questi chip appartengono alla famiglia “Digital Programmable CNN” (DPCNN) e presentano principalmente due caratteristiche: la programmabilità digitale dei pesi sinaptici come una particolare architettura orientata ad una struttura interconnessa (cioè connettendo tra loro più di questi chip è possibile realizzare reti di grande dimensione). In questa tesi viene data una visione di insieme sulle ANN, sulle CNN e sulle Star-CNN: cosa sono, come funzionano ed a cosa servono. In perticolare verrà descritta la famiglia DP-CNN. Questa tesi propone una nuova architettura chiamata TD-CNN (Time Division CNN), che sfrutta una particolare strategia mirata a ridurra l’area di occupazione su silicio di una cella elementare, per aumentare l’integrabilità della rete. Oltretutto la stessa strategia a divisione di tempo verrà applicata alle TD-Star CNN. In particolare questi circuiti sono le non-linerità digitalmente programmabili (cioè DPTA – Digital Programmable Transconductance Amplifier e DPTA – Digital Programmable Transconductance Comparator) e circuiti particolari per la multiplazione (DM-SH – Dynamic Mirror Sample and Hold e DM-MUX – Dynamic Mirror Multiplexer). Sono mostrate alcune simulazioni dei circuiti per permettere lo studio di queste nuove architetture, e la modifica delle dinamiche introdotte dalla strategia a divisione di tempo.
The Artificial Neural Network (ANN) paradigm consists of the application of biological “neural” models to the solution of particular problems that often are very hard to solve for the classical “Von Neumann” architectures. Different are the approaches proposed in literature for the implementation of an ANN. Some of them are software implementations only while, others are circuital solutions as full custom digital circuits or programmed FPGAs (Field Programmable Gate Array) as well as analogue circuits and the typology of the implementation certainly depends on the length of the processing time that you believe adequate for the particular application. This thesis is focused on the design of new analogue circuits well suited for Neural Network applications. In particular, the class of the Cellular Neural Networks (CNN), proposed in 1981 by Prof. L.O.Chua (University of California - Berkeley), will be exploited. In this area, the “Laboratorio Circuiti” at University of Rome “Tor Vergata” designed and manufactured several analogue chips devoted to this class of Neural Networks. These chips belong to the Digital Programmable CNN (DPCNN) chip family and present two main features: the digital programmability of the synaptic weights as well as a special architecture oriented to an interconnection structure (i.e. it is possible to carry out large network by connecting together more of these chips). In this thesis work you will find an overview about the Artificial Neural Network, the Cellular Neural Network and the Star Cellular Neural Network: what they are, how they work and why they are useful. In particular, the DP-CNN chip family will be deeply described. This thesis proposes the TD-CNN (Time Division CNN), a particular design strategy, devoted to reduce the silicon area occupation of the a elementary cell in order to improve the VLSI integrability of the network. Moreover, the same time-division strategy will be applied to TD-Star CNN. In particular, these circuits consist of the digitally programmable non-linearity circuits (i.e. the Digital Programmable Transconductance Amplifier - DPTA and Digital Programmable Transconductance Comparator – DTPC) and special circuit for to carry out the multiplexing feature (i.e. the Dynamic Mirror Sample and Hold – DM-SH and the Multiplexer – DM-MUX). Several circuital simulations will be shown in order to study the behavior of this modified architecture and the modifications on the dynamics introduced by the time division strategy.

Lindeberg, Johan. "Design and Implementation of a Low-Power SAR-ADC with Flexible Sample-Rate and Internal Calibration." Thesis, Linköpings universitet, Elektroniksystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-103229.

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The objective of this Master's thesis was to design and implement a low power Analog to Digital Converter (ADC) used for sensor measurements. In the complete measurement unit, in which the ADC is part of, different sensors will be measured. One set of these sensors are three strain gauges with weak output signals which are to be pre-amplified before being converted. The focus of the application for the ADC has been these sensors as they were considered a limiting factor. The report describes theory for the algorithmic and incremental converter as well as a hybrid converter utilizing both of the two converter structures. All converters are based on one operational amplifier and they operate in repetitive fashions to obtain power efficient designs on a small chip area although at low conversion rates. Two converters have been designed and implemented to different degrees of completeness. One is a 13 bit algorithmic (or cyclic) converter which uses a switching scheme to reduce the problem of capacitor mismatch. This converter was implemented at transistor level and evaluated separately and to some extent also with sub-components. The second converter is a hybrid converter using both the operation of the algorithmic and incremental converter to obtain 16 bits of resolution while still having a fairly high sample rate.

Seal, Amy. "Scoring Sentences Developmentally: An Analog of Developmental Sentence Scoring." BYU ScholarsArchive, 2002. https://scholarsarchive.byu.edu/etd/1141.

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A variety of tools have been developed to assist in the quantification and analysis of naturalistic language samples. In recent years, computer technology has been employed in language sample analysis. This study compares a new automated index, Scoring Sentences Developmentally (SSD), to two existing measures. Eighty samples from three corpora were manually analyzed using DSS and MLU and the processed by the automated software. Results show all three indices to be highly correlated, with correlations ranging from .62 to .98. The high correlations among scores support further investigation of the psychometric characteristics of the SSD software to determine its clinical validity and reliability. Results of this study suggest that SSD has the potential to compliment other analysis procedures in assessing the language development of young children.

Rajendran, Dinesh Babu. "Design of Pipelined Analog-to-Digital Converter with SI Technique in 65 nm CMOS Technology." Thesis, Linköpings universitet, Elektroniksystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-70579.

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Analog-to-digital converter (ADC) plays an important role in mixed signal processingsystems. It serves as an interface between analog and digital signal processingsystems. In the last two decades, circuits implemented in current-modetechnique have drawn lots of interest for sensory systems and integrated circuits.Current-mode circuits have a few vital advantages such as low voltage operation,high speed and wide dynamic ranges. These circuits have wide applications in lowvoltage, high speed-mixed signal processing systems. In this thesis work, a 9-bitpipelined ADC with switch-current (SI) technique is designed and implemented in65 nm CMOS technology. The main focus of the thesis work is to implement thepipelined ADC in SI technique and to optimize the pipelined ADC for low power.The ADC has a stage resolution of 3 bits. The proposed architectures combine adifferential sample-and-hold amplifier, current comparator, binary-to-thermometerdecoder, a differential current-steering digital-to-analog converter, delay logic anddigital error correction block. The circuits are implemented at transistor level in 65nm CMOS technology. The static and dynamic performance metrics of pipelinedADC are evaluated. The simulations are carried out by Cadence Virtuoso SpectreCircuit Simulator 5.10. Matlab is used to determine the performance metrics ofADC.

Moulay, Valentin. "Recherche de chimie prébiotique et d'indices de vie sur les mondes océans par analyse in situ de matière organique." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASP092.

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La présence d'océans sous la surface de certains des satellites glacés de Jupiter (e.g. Europe) et de Saturne (e.g. Titan, Encelade) couplée à l'existence de geysers permettant l'échantillonnage de leurs profondeurs a fait émerger le fort potentiel exobiologique de ces corps planétaires du système solaire. De telles découvertes ont suscité le développement de futures missions spatiales (Dragonfly pour Titan et concepts de missions pour Europe et Encelade) pour comprendre la chimie de surface de ces mondes-océan, et par extension de rechercher des traces de chimie prébiotique ou de vie passée ou actuelle. La quête de telles signatures nécessite un analyseur chimique à bord des sondes qui seront envoyées dans le système solaire externe. De nombreuses techniques analytiques peuvent être mises en œuvre mais la chromatographie en phase gazeuse couplée à la spectrométrie de masse (CPG-SM) apparaît comme une technique de premier choix pour tenter de répondre à ces questions, de par son héritage dans l'exploration spatiale, sa capacité à analyser une large gamme de composés organiques et son potentiel pour détecter des biosignatures notamment par l'étude de l'énantiomérie des espèces chirales.L'objectif de ce travail de thèse est de préparer la future analyse chimique in situ de ces lunes glacées, d'une part par l'amélioration des connaissances scientifiques et d'autre part par l'optimisation technique des instruments. Il s'agit d'évaluer et d'optimiser les capacités analytiques de la CPG-SM et des méthodes de préparation d'échantillon associées, afin de détecter des molécules organiques et biosignatures avec les contraintes analytiques connues et/ou attendues sur ces corps planétaires (richesse en matière organique des échantillons prélevés pour Titan et présence d'eau de sels pour les échantillons à la surface d'Europe et d'Encelade). Dans le cas d'Europe et Encelade, l'étude d'échantillons hypersalins terrestres a permis de mettre en avant les capacités de la CPG-SM et des méthodes de prétraitements associées pour la recherche de molécules organiques d'intérêt pour l'exobiologie malgré la présence de sels. Pour évaluer l'impact du sel sur ces méthodes, le développement d'un protocole de dessalement a été entrepris et mis en place. Outre l'aspect analytique, mon travail a permis la sélection et la caractérisation des performances des colonnes chromatographiques (générale et chirale) qui seront intégrées à l'instrument DraMS à bord de la sonde Dragonfly (e.g. Dragonfly Mass Spectrometer, DraMS). Pour ces différents aspects, ce travail s'est appuyé sur l'étude d'échantillon analogues synthétiques (tholins pour Titan) mais aussi naturels (lac hypersalin pour Europe et Encelade)
The presence of oceans beneath the surface of some of Jupiter's (e.g. Europa) and Saturn's (e.g. Titan, Enceladus) icy satellites, coupled with the existence of geysers that allow their depths to be sampled, has highlighted the strong exobiological potential of these planetary bodies in the solar system. Such discoveries have motivated the development of future space missions (Dragonfly for Titan and mission concepts for Europa and Enceladus) to understand the surface chemistry of these ocean worlds, and by extension to search for traces of prebiotic chemistry or past or present life. The search for such signatures requires a chemical analyzer on board the probes that will be sent into the outer solar system. Many analytical techniques can be used, but gas chromatography-mass spectrometry (GC-MS) appears to be one of the best techniques for answering these questions, thanks to its heritage in space exploration, its ability to analyze a wide range of organic compounds, and its potential for detecting biosignatures, especially by studying the enantiomery of chiral species.The aim of this thesis is to prepare for future in situ chemical analysis of these icy moons, both by improving our scientific knowledge and by technically optimizing our instruments. The main purpose is to evaluate and optimize the analytical capabilities of GC-MS and associated sample preparation methods, in order to detect organic molecules and biosignatures within the analytical constraints known and/or expected on these planetary bodies (richness in organic matter in samples from Titan, and presence of water and salts in samples from the surface of Europa and Enceladus, etc.). In the case of Europa and Enceladus, the study of hypersaline terrestrial samples has highlighted the ability of GC-MS and associated pretreatment methods to find organic molecules of interest for exobiology, despite the presence of salts. In order to assess the impact of salt on these methods, a desalination protocol was developed and implemented. In addition to the analytical aspect, my work has enabled the selection and characterization of the performance of the chromatographic columns (general and chiral) that will be integrated into the DraMS instrument on board the Dragonfly probe (e.g. Dragonfly Mass Spectrometer, DraMS). For these different aspects, this work was based on the study of synthetic analogous samples (tholins for Titan) as well as natural ones (hypersaline lake for Europa and Enceladus)

Thompson, Michelle, and Michelle Thompson. "Understanding Space Weathering of Asteroids and the Lunar Surface: Analysis of Experimental Analogs and Samples from the Hayabusa and Apollo Missions." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/620874.

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Grains on the surfaces of airless bodies are continually being modified due to their exposure to interplanetary space, a phenomenon known as space weathering. This dissertation uses a multi-faceted approach to understanding space weathering of the lunar and asteroidal surfaces. Chapters 1 and 2 provide an introduction to space weathering and a discussion of the methods employed in this work, respectively. Chapter 3 focuses on the analysis of returned samples from near-Earth asteroid Itokawa using the transmission electron microscope (TEM) and contributes to the first-ever comparison of microstructural and chemical features of space weathering in returned samples from two different airless bodies. This research uses high-resolution imaging and quantitative energy-dispersive x-ray spectroscopy (EDS) measurements to analyze space weathering characteristics in an Itokawa soil grain. These analyses confirm that space weathering is operating on the surface of Itokawa, and that many of the resulting features have similarities to those observed in lunar soils. Results show that while there is evidence that both major constituent space weathering processes are operating on the surface of Itokawa, solar wind irradiation, not micrometeorite impacts, appears to be the dominant contributor to changes in the microstructure and chemistry of surface material. Chapter 4 presents a detailed study of nanophase Fe (npFe) particles in lunar soil samples. For the first-time, the oxidation state of individual npFe particles was directly measured using electron energy-loss spectroscopy (EELS) in the TEM. The results show that npFe particles are oxidizing over their time on the lunar surface, and that the amount of oxidized Fe in the nanoparticles is correlated with soil maturity. The EELS data are also coupled to atomic-resolution imaging, which is used to determine the structure of the nanoparticles, confirming their mineral phase. This work challenges the long-standing paradigm that all npFe particles are composed of metallic Fe and that the chemical composition of these features remains static after their formation. A theoretical modeling investigation of the influence that npFe particles of different oxidation states have on the spectral properties of the material is also presented. The model results show that varied Fe-oxidation states of the nanoparticles can produce subtle changes in the optical properties of the soils, including the degree of reddening and the attenuation of characteristic absorption bands. These findings should be accounted for in future modeling of reflectance spectra. Chapter 5 presents a novel technique for simulating space weathering processes inside the TEM. Using an in situ heating holder, lunar soils were subjected to both slow- (~minutes) and rapid-heating (

Smith, David Niel. "An investigation of the potential of modern analogue faunas to act as comparisons to palaeoentomological samples from archaeological farm sites." Thesis, University of Sheffield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274219.

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James, Lisa Marie. "An examination of the link between emotional and behavioral dysregulation in an analogue sample of women with borderline personality disorder." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-06292009-194702.

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Thesis (Ph. D.)--Florida State University, 2009.
Advisor: Jeanette Taylor, Florida State University, College of Arts and Sciences, Dept. of Psychology. Title and description from dissertation home page (viewed on October 13, 2009). Document formatted into pages; contains viii, 67 pages. Includes bibliographical references.

Voß, Maria [Verfasser], and Thomas [Akademischer Betreuer] Ehring. "Impaired cognitive control as a causal risk factor for intrusive re-experiencing and rumination in posttraumatic stress disorder : insights from analogue and clinical samples / Maria Voß ; Betreuer: Thomas Ehring." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1221061895/34.

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Rodesten, Stephan. "Program för frekvensanalys." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-58157.

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Denna rapport täcker arbetsprocessen bakom att skapa en spektrumanalysator. Läsaren kommer att få läsa om den valda metoden men även alternativa metoder. Utöver detta kommer även de teoretiska delarna bakom varje moment att undersökas samt jämföras med potentiella alternativa lösningar. Projektet har utförts på uppdrag av KA Automation. Syftet med projektet var att skapa en basplattform för analys av ljudfrekvenser. Målet med detta var att kunna identifiera ljudegenskaper i form av frekvenserna hos exempelvis servomotorer i vattenpumpar. Tanken var att i ett senare utvecklingsskede kunna identifiera om och när nya frekvenser dykt upp i ljudprofilen vilket i sådana fall kan resultera i att motorn är i behov av service. Basplattformen är uppbyggd med hjälp av C# och ljudbehandlingsbiblioteket NAudio. Från resultatet kan slutsatsen dras att detta program kan analysera ljud och visa de olika frekvensernas styrka och därmed är en lämplig basplattform för vidareutveckling.
This report will cover the work process behind creating a spectrum analyzer. The reader will be able to read about the chosen method but also the alternative methods. Apart from this the theoretical parts behind every moment will also be covered and compared to potential alternative solutions. The project has been carried out on behalf of KA Automation. The purpose of the project was to create a base for analyzing sound frequencies. The goal was to be able to identify sound properties in the form of frequencies in servo motors in for example water pumps. The idea was to be able to in a later development stage be able to identify when new frequencies have entered the audio profile which might result in the motor to be in need of service. The base is created with the help of C# and the sound library NAudio. From the result one can conclude that this program can analyze sound and display the magnitude of its frequency components and is therefore a suitable base for future development.

Kus, Václav. "Analogový univerzální oscilátor s transadmitančními zesilovači." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218853.

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The aim of this thesis is to design a universal analog oscillator using transconductance amplifiers. For studying behaviour of chaotic dynamical systems can be used systems Class C. Suitable way for the purpose modeling dynamic phenomena arising in these systems is an electronic circuit that exhibits the same behavior as modeled system. After familiarization with the basic principles of synthesis of integrators systems, and studying the involvement of frequently used functional blocks were designed the concept of universal chaotic oscillator using transconductance amplifiers. The functionality of this circuit has been verified by PSpice simulation program. A typical feature of chaotic oscillator is extremely sensitivity to initial conditions. Each small change on the initial parameters can lead to major change in the shape of the attractor. The result of this thesis is a functional sample of a universal chaotic oscillator, which was verified by the dynamic behavior of the given differential equations.

Kolarik, Vladimir. "Techniques avancées de test de circuits analogiques et mixtes analogiques/numériques." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0108.

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Le test de circuits integres devient de plus en plus complique avec le niveau croissant d'integration. Les techniques de conception en vue de la testabilite doivent etre adoptees tres tot dans le cycle de la conception de circuits numeriques. Des problemes similaires existent dans le domaine de circuits analogiques et mixtes analogiques-numeriques. Le developpement de systemes testables doit etre effectue avec des precautions vis-a-vis des problemes de test. La premiere partie de ce document porte sur les methodes de test hors ligne pour les circuits analogiques et mixtes analogiques-numeriques. Un resume des methodes de test et des techniques de conception en vue de la testabilite sont presentes. Une methode particuliere pour la propagation de signal a travers des circuits analogiques a ete mise en uvre. La deuxieme partie de la these est consacree aux methodes de test en ligne. Apres une presentation de la theorie des circuits auto-testables en ligne, une methode de conception est proposee pour des circuits equilibres testables en ligne. Deux exemples de conception concluent la deuxieme partie: un echantillonneur-bloqueur testable en ligne et des controleurs auto-verifies

Belkadi, Djilali. "Contribution à la modélisation et à la simulation des circuits intégrés analogiques : application aux systèmes échantillonnés et aux circuits linéaires de haute fréquence." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0062.

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Ce travail est une contribution a la modelisation et la simulation temporelle des circuits integres analogiques. Suite au besoin de la conception descendante et aux limites de la simulation electrique, la conception sur differents niveaux d'abstraction est devenue necessaire. Puisque les circuits integres analogiques sont divers, nous en avons choisi deux types : les systemes echantillonnes et les circuits lineaires de haute frequence. Dans le premier genre, une methode de simulation est proposee. Elle est basee sur la linearisation du circuit par phase d'horloge et la resolution analytique des equations differentielles. La nouveaute qu'elle porte est de rendre la simulation transitoire du bruit physique possible en utilisant la notion du bruit gele. Quant aux circuits lineaires de haute frequence, une nouvelle methode appelee cifft est proposee afin de calculer une reponse impulsionnelle causale a partir des donnees frequentielles tabulees. En concretisation de ce travail, nous avons developpe deux modules delta sigma design kit et s-model (integre dans le simulateur eldo) pour la simulation transitoire des modulateurs - de type mash et les circuits definis par des donnees frequentielles tabulees.

Larabi, Islam Amine. "Nouveaux produits de synthèse : analyse, consommation et métabolisme ; Applications cliniques et médicolégales Rapid and simultaneous screening of new psychoactive substances and conventional drugs of abuse. A comparative study of Biochip Array Technology versus LC-MS/MS in whole blood and urine Development of a sensitive untargeted liquid chromatography– high resolution mass spectrometry screening devoted to hair analysis through a shared MS2 spectra database: A step toward early detection of new psychoactive substances Validation of an UPLC-MS/MS method for the determination of sixteen synthetic cannabinoids in human hair. Application to document chronic use of JWH-122 following a non-fatal overdose Development and validation of liquid chromatography-tandem mass spectrometry targeted screening of 16 fentanyl analogs and U-47700 in hair: Application to 137 authentic samples Prevalence and Surveillance of Synthetic Cathinones Use by Hair Analysis: An Update Review Prevalence of New Psychoactive Substances(NPS) and conventional drugs of abuse (DOA) in high risk populations from Paris(France) and its suburbs A cross sectional study by hair testing(2012–2017) Evaluation of drug abuse by hair analysis and self-reported use among MSM under PrEP: Results from a sub-study of the ANRS-IPERGAY trial. Hair testing for 3‑fluorofentanyl, furanylfentanyl, methoxyacetylfentanyl, carfentanil, acetylfentanyl and fentanyl by LC–MS/MS after unintentional overdose Drug‐facilitated sexual assault (DFSA) involving 4‐methylethcathinone (4‐MEC),3,4‐Methylenedioxypyrovalerone (MDPV), and doxylamine highlighted by hair analysis Metabolic Profiling of Deschloro-N-ethyl-ketamine (O-PCE) and identification of new target metabolites in urine and hair using human liver microsomes and high-resolution accurate mass spectrometry." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASL029.

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L’objectif de ce travail a été de développer deux approches analytiques dédiées à l’analyse toxicologique des nouveaux produits de synthèse (NPS) dans différentes matrices biologiques (sang, urine et cheveux). La première est basée sur le criblage non ciblé par chimiluminescence sur biopuces et chromatographie liquide couplée à la spectrométrie de masse haute résolution (LC-HRMS) et la deuxième correspond à un criblage ciblé par spectrométrie de masse en tandem (LC-MS/MS). Ces deux approches ont ensuite été appliquées dans des études observationnelles pour évaluer la consommation de NPS dans des populations à risques de surdosage, de pharmacodépendance ou de soumission chimique dans un contexte clinique ou médico-judiciaire.La dernière partie a été consacrée au développement d’un nouvel outil analytique de traitement des données issues de la LC-HRMS qui a permis d’étudier le métabolisme de 9 NPS in vitro sur des cultures de microsomes du foie humain (HLM) et in vivo sur des échantillons biologiques d’usagers de ces drogues. Cette dernière approche a permis la création d’une bibliothèque de spectres de haute résolution composée de 228 métabolites dont certains ont été proposés comme marqueurs pertinents d’exposition aux NPS dont ils sont issus.Ce travail a été concrétisé par la rédaction de 10 publications scientifiques et a permis d’initier plusieurs collaborations pluridisciplinaires
The aim of the present work was to develop two analytical approaches dedicated to the analysis of new psychoactive substances in different biological matrices (blood, urine and hair). The first approach is based on untargeted screening by both biochip array technology chemiluminescence assay and liquid chromatography coupled to high resolution mass spectrometry (LC-HRMS) and the second corresponds to a targeted screening by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). These two approaches were then applied in observational studies to assess the consumption of NPS in high risk populations (overdose, drug abuse, drug facilitated crimes) in clinical and forensic settings. The last part of the work was devoted to the development of a new analytical tool for LC-HRMS data processing which made it possible to study the metabolism of 9 NPS In vitro on human liver microsomes (HLM) and In vivo in biological samples from drug users. This approach has enabled the creation of HRMS spectral library containing 228 metabolites, some of which have been proposed as relevant markers of NPS exposure.This work has resulted on 10 scientific publications and allowed to initiate many multidisciplinary collaborations

Noordhuis-Fairfax, Sarina. "Field | Guide: John Berger and the diagrammatic exploration of place." Phd thesis, Canberra, ACT : The Australian National University, 2018. http://hdl.handle.net/1885/154278.

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Positioned between writing and drawing, the diagram is proposed by John Berger as an alternative strategy for articulating encounters with landscape. A diagrammatic approach offers a schematic vocabulary that can compress time and offer a spatial reading of information. Situated within the contemporary field of direct data visualisation, my practice-led research interprets Berger’s ‘Field’ essay as a guide to producing four field | studies within a suburban park in Canberra. My seasonal investigations demonstrate how applying the conventions of the pictorial list, dot-distribution map, routing diagram and colour-wheel reveals subtle ecological and biographical narratives.

"Design of a Twelve Bit, Four Hundred Mega-Samples-per-Second, Interpolating Dual Channel Digital to Analog Converter Featuring Digital Modulation." Master's thesis, 2013. http://hdl.handle.net/2286/R.I.20961.

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abstract: Digital to analog converters (DACs) find widespread use in communications equipment. Most commercially available DAC's which are intended to be used in transmitter applications come in a dual configuration for carrying the in phase (I) and quadrature (Q) data and feature on chip digital mixing. Digital mixing offers many benefits concerning I and Q matching but has one major drawback; the update rate of the DAC must be higher than the intermediate frequency (IF) which is most commonly a factor of 4. This drawback motivates the need for interpolation so that a low update rate can be used for components preceding the DACs. In this thesis the design of an interpolating DAC integrated circuit (IC) to be used in a transmitter application for generating a 100MHz IF is presented. Many of the transistor level implementations are provided. The tradeoffs in the design are analyzed and various options are discussed. This thesis provides a basic foundation for designing an IC of this nature and will give the reader insight into potential areas of further research. At the time of this writing the chip is in fabrication therefore this document does not contain test results.
Dissertation/Thesis
M.S. Electrical Engineering 2013

Haftbaradaran, Mohammadi Afshin. "Sample timing control in analog front-ends." 2008. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=742563&T=F.

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Malachira, Bopanna Kariappa. "Low-power sampled-data dual-slope ADC /." 2007. http://proquest.umi.com/pqdweb?did=1421621561&sid=9&Fmt=2&clientId=10361&RQT=309&VName=PQD.

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Chou, Kuan-Hung, and 周冠宏. "A 10-bit 500M-sample/sec Digital to Analog Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/82184302127011166824.

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碩士
國立成功大學
電機工程學系碩博士班
93
In this paper, a 10-bit 500-MSample/s CMOS digital-to-analog (D/A) converter is presented. It is based on a current steering segmented 5 + 5 architecture that comprises 5MSB’s unary cells and 5LSB’s binary weighted cells in this design. 　The 500-MSample/s conversion rate has been obtained by an, at transistor level, fully custom designed thermometer decoder and synchronization circuit. In the digital part, a high speed, high output crossing-point latch is designed to minimize the glitch energy. Moreover, using cascade current cell in analog part can increase the output impedance and improve the performance of the SNDR and SFDR. 　From the simulation result, the glitch energy is 0.995 psec-V. For a near 250 MHz input signal at 500 MHz sampling rate, the SNDR is about 60dB. The power consumption of this DAC with a single 3.3V supply is 70 mW. Proper area of current source transistor is chosen to overcome mismatch error due to process variation. This DAC chip is fabricated using TSMC 0.18μm-1P6M CMOS process and the die area is 1.07mm×1.07mm.

Schmid, Volker 1969. "Feedback design for sampled analog phase and gain detection in MDFE." Thesis, 1995. http://hdl.handle.net/1957/36271.

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Hong, Hao-Chiao, and 洪浩喬. "Sigma-Delta Modulation Based Analog BIST Scheme for Sampled-Data Systems." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/56272718088552629382.

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Guan-YuanLi and 李冠沅. "A 10-bit 800M-Sample/s Current-Steering Digital-to-Analog Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/89046419595938106066.

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Sun, Kae-Oh. "High speed nyquist-rate digital-to-analog converter design techniques based on sampled signal synthesis." 2006. http://www.library.wisc.edu/databases/connect/dissertations.html.

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Shau, Tz-Jing, and 邵姿菁. "A High-Speed Pipelined Analog-to-Digital Converter Using Wide-band Sample-and-Hold Amplifier." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11783467475044626175.

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碩士
國立成功大學
電機工程學系碩博士班
97
With the advance of deep submicron technology, the low supply voltage will become the trend of circuit development due to the device’s reliability issues. However, the signal dynamic range will be decreased because of the reduction of supply voltage. In order to maintain the dynamic range, the noise and signal distortion must be suppressed. By this way, it will indirectly increase the power consumption of analog circuits. Especially, a high-gain op-amp is necessitated to guarantee the required accuracy in the conventional pipelined ADC. However, due to the process limitations, it is difficult to implement such a high-gain op-amp. The penalty of additional power dissipation must be paid to implement this op-amp. In this thesis, a technique called as wide-band folded SHA is proposed to relax the requirement of high-gain op-amp and increase the tolerable input swing in a pipelined ADC. A 10-bit 200 MS/s pipelined ADC with the proposed wide-band folded SHA has been designed with the TSMC 0.18 �慆 CMOS 1P6M process to demonstrate the effectiveness of the proposed SHA.

陳志成. "= The design and analysis of new current-mode analog-to-digital converters and sample/hold circuits." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/33173074526994262633.

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Chu, Shi-Xuan, and 儲世軒. "A 10-bit 800M-Sample/s Current-Steering Digital-to-Analog Converter and Foreground Calibration Techniques." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/25731764370406717248.

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碩士
國立中正大學
電機工程所
96
A 10-bit 800M-Sample/s current-steering digital-to-analog converter(DAC) is designed in this thesis. Considering both circuit linearity and chip area, binary-weighted code and thermometer codes are used in encoding. Area analysis is used to overcome process variations for current source transistors. In order to reduce glitch and enhance dynamical performance of the DAC, filp-flops are utilized in signal synchronization. The chip is implemented in TSMC 0.18μm 1P6M CMOS technology. Simulation results show that the SFDR of the current-steering DAC with an input frequency of 102MHz under sampling frequency of 800MHz is 61.9dB. The DNL is about +0.454/-0.258LSB and INL is about +0.310/-0.206LSB. The total area is 1.458 x 1.248 mm2. The total power consumption is 20.98mW. With the experience of the area analysis to overcome process variations, then a new foreground calibration technique is proposed. Only 6 bits are for required analyzing current source transistors area and overall 12-bit linearity could be reached after calibration. The key concept of the calibration scheme is to control the body voltages of the current source transistors. The actual threshold voltage varied accordingly and hence the drain current Id is calibrated. The DAC operates with supply voltage of 1.8V, and can achieve 12-bit resolution at sampling frequency of 250MHz. Furthermore, this DAC demonstrates small-area characteristic.

Su, Chung-Wei, and 蘇純緯. "A 6-bit 1GHz Sample Rate Pipelined Analog-to-Digital Converter With Open-Loop Residue Amplifiers." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/91316776782720834425.

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碩士
國立中興大學
電機工程學系所
99
By aggressive device scaling in modern integrated circuit technology, the computing power of digital circuits increases significantly. But the low power supply and relative high threshold voltage of transistors exhibit design constraints for analog circuit. Analog-to-digital converters(ADCs) are the key components to connect the real world with the discrete-computation fields. Due to their extensive use of analog and mixed analog-digital operations, ADC often appears as the bottleneck in data processing applications, resulting in limiting the overall speed or precision. In this thesis, we describe the implementation and measurement results of a 6-bit 1-GS/s pipelined ADC with open-loop residue amplification. Employing voltage-mode open-loop amplifiers in 1.5-bit conversion per stage, global gain control techniques in gain stages, the proposed ADC relaxes stringent design tradeoffs between speed and power. The measurement results achieves ENOB of 3.9-bit for low frequency input that is better than high frequency input for resolution. The measured DNL is within 1.17 LSB and –1.19 LSB and the measured INL is within 1.73 LSB and –1.57 LSB. The total power dissipation is 25 mW. The chip is fabricated in a TSMC 90nm CMOS Mixed Signal RF 1P9M CMOS technology, the all area is 0.65mm X 0.65mm and the core area is 0.199mm X 0.144mm.

Hayward, Roger D. "Improving a sampled-data circuit simulator for Delta-Sigma modulator design." Thesis, 1992. http://hdl.handle.net/1957/36732.

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Delta-Sigma Modulator-based Analog-to-Digital converter design is an active area of research. New topologies require extensive simulations to verify their performance. A series of improvements were made to an existing circuit simulation package in order to speed the simulation process for the designer. Various examples of these improvements are presented in typical applications.
Graduation date: 1992

PEI-JYUAN, TSAI, and 蔡佩娟. "6-bit 1G sample/s CMOS flash analogue-to-digital converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/42342328846032837908.

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碩士
建國科技大學
電子工程系暨研究所
99
We present a 6-bit 1G sample/s CMOS flash analogue-to-digital converter (ADC) with new design concepts. First, we use a three input AND gate in sample and holding(S/H) structure to replace the conventional resistor and capacitor one that improves the dimensional error from process. Second, we propose a coding circuit without one-out-of-n encoder and the complexity of the circuit is largely reduced. In this 6 bit flash ADC structure, the input signal was compared with reference voltage generated by resistor array, then forward to sampling circuit. The sampling values were transfer to the Thermometer code and then the Gray code in order to eliminate the bubble problem in the encoding process. Finally, Binary code is used for the resulting output digital signals. The designed ADC is fabricated in TSMC 0.35μm 2P4M CMOS technology. The voltage working range of the ADC is from 0.9 to 1.8V which dramatically lower the power consumption to 25.478mW. This 6-bit 1G sample/s CMOS flash ADC is low cost, low power consumption and high accuracy.

Du, Yan-Yi, and 杜彥頤. "Observer-Based Digital Redesign Tracker for Nonlinear Sampled Data Systems via a Hybrid Design of EP-Based Iterative Learning Control and Linear Quadratic Analog Tracker." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/27812654937025861757.

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碩士
國立成功大學
電機工程學系碩博士班
95
In this thesis, a novel observer-based digital redesign tracker, whose parameters are given by a hybrid design of EP-based iterative learning control and linear quadratic analog tracker, is proposed to resolve the output tracking problem for a class of nonlinear sampled data systems. The tracker possesses good tracking performance in transient state response as well as in steady that when an appropriate sampling time is given. Furthermore, its tracking result is better than that of an original digital redesign tracker at a large sampling time. Firstly, the ideal system state is obtained from the hybrid design of iterative learning control (ILC) and linear quadratic analog tracker (LQAT). Then, according to the optimal linearization algorithm, the nonlinear system will be converted into the linear model by the state as operating point at each sampling time. Finally, these models will be applied to design the digital redesign tracker which preserves the perfect tracking performance of the analog controller. In addition, an observer, whose design idea is derived from the method of the linear quadratic regulator (LQR), will be applied in the digital redesign tracker, when some system state could not be acquired. Furthermore, in order to improve the learning convergence of ILC, evolutionary programming will be applied to search for the optimal learning gain of ILC; three improved subjects of ILC, the initial control input decision, the observer design by optimal linearization algorithm and LQR, and the improved update learning rule for the second order derivative system, whose product matrix of C and B is not full rank, will be presented in this thesis. Several MIMO illustrative examples will be presented to demonstrate the effectiveness of the proposed methodology.