Global ETD Search

91	DESIGN OF A HIGH-POWER, HIGH-EFFICIENCY, LOW-DISTORTION DIRECT FROM DIGITAL AMPLIFIER Earick, Weston R. 15 December 2006 (has links) No description available. high-power high-efficiency low-distortion direct from digital digital amplifier amplifier digital-to-analog converter DAC audio total harmonic distortion THD high-fidelity
92	Instrumentação eletrônica de apoio para um sistema de epitaxia por feixes moleculares / Electronic hardware development for molecular beam epitaxy. Arakaki, Haroldo 29 March 1994 (has links) Neste trabalho é apresentado o desenvolvimento de instrumentação eletrônica para controle e automação de um sistema de crescimento de semicondutores por Epitaxia por Feixes Moleculares. Envolve uma variedade de circuitos analógicos e digitais como: um módulo de aquisição de dados e controle baseado em uma UCP Z-80, contendo algumas interfaces digitais e analógicas multiplexadas, e comunicando-se com um microcomputador através de uma interface serial. Envolve ainda o desenvolvimento de controladores de temperatura analógicos tipo P.I.D., atuação por motores de passo e circuitos de condicionamento de sinal. / In this work is presented the development of electronic instrumentation for automation and control of a Molecular Beam Epitaxy semiconductor growth system. A variety of analog and digital instrumentation circuits have been designed and implemented, including a data acquisition and control system based on a Z-80 CPU, which controls some multiplexed digital and analog interfaces and talks to a microcomputer using serial communication. Other circuits have been also developed, including analog temperature controllers, stepper motor actuators and circuits for signal conditioning. Analog to digital conversion Aquisição de dados Controle de temperatura Conversor AD Conversor DA Data acquisition Digital to analog conversion Epitaxia por feixes moleculares Interface para PC Molecular beam epitaxy Motor de passo PC interface Step motor Temperature control Z80 Z80
93	"Analogue Network of Converters": a DfT Technique to Test a Complete Set of ADCs and DACs Embedded in a Complex SiP or SoC Kerzerho, Vincent 22 February 2008 (has links) (PDF) Une nouvelle méthode de test pour les convertisseurs ADC et DAC embarqués dans un système complexe a été développée en prenant en compte les nouvelles contraintes affectant le test. Ces contraintes, dues aux tendances de design de systèmes, sont un nombre réduit de point d'accès aux entrées/sorties des blocs analogiques du système et une augmentation galopante du nombre et des performances des convertisseurs intégrés. La méthode proposée consiste à connecter les convertisseurs DAC et ADC dans le domaine analogique pour n'avoir besoin que d'instruments de test numériques pour générer et capturer les signaux de test. Un algorithme de traitement du signal a été développé pour discriminer les erreurs des DACs et ADCs. Cet algorithme a été validé par simulation et par expérimentation sur des produits commercialisés par NXP. La dernière partie de la thèse a consisté à développer de nouvelles applications pour l'algorithme. [SPI] Engineering Sciences [SPI] Sciences de l'ingénieur Test analog to digital converter (ADC) digital to analog converter (DAC) system-inpackage (SiP) analog network of converters (ANC) dynamic parameters total harmonic distortion (THD) spurious free dynamic range ( SFDR)
94	Instrumentação eletrônica de apoio para um sistema de epitaxia por feixes moleculares / Electronic hardware development for molecular beam epitaxy. Haroldo Arakaki 29 March 1994 (has links) Neste trabalho é apresentado o desenvolvimento de instrumentação eletrônica para controle e automação de um sistema de crescimento de semicondutores por Epitaxia por Feixes Moleculares. Envolve uma variedade de circuitos analógicos e digitais como: um módulo de aquisição de dados e controle baseado em uma UCP Z-80, contendo algumas interfaces digitais e analógicas multiplexadas, e comunicando-se com um microcomputador através de uma interface serial. Envolve ainda o desenvolvimento de controladores de temperatura analógicos tipo P.I.D., atuação por motores de passo e circuitos de condicionamento de sinal. / In this work is presented the development of electronic instrumentation for automation and control of a Molecular Beam Epitaxy semiconductor growth system. A variety of analog and digital instrumentation circuits have been designed and implemented, including a data acquisition and control system based on a Z-80 CPU, which controls some multiplexed digital and analog interfaces and talks to a microcomputer using serial communication. Other circuits have been also developed, including analog temperature controllers, stepper motor actuators and circuits for signal conditioning. Aquisição de dados Controle de temperatura Conversor AD Conversor DA Epitaxia por feixes moleculares Interface para PC Motor de passo Z80 Analog to digital conversion Data acquisition Digital to analog conversion Molecular beam epitaxy PC interface Step motor Temperature control Z80
95	Návrh digitálně-analogového převodníku typu sigma-delta v technologii CMOS / Design of sigma-delta digital-to-analog converter in CMOS technology Soukup, Luděk January 2012 (has links) This master’s thesis deals with the issue of digital to analog conversion and possibility of its realization in digital circuits. Goal of this project is to design sigma-delta digital to analog converter with resolution of 14 bits and frequency band (0 ÷ 20) kHz. Main functional blocks: interpolator and modulator sigma-delta will be realized like digital structures. Reconstruction filter will be realized like an analog structure. For design a check of parameters of designed converter programs MATLAB and Simulink are used. Designed digital structures will be described by VHDL language.
96	Využití bezdrátových technologií k přenosu audio signálu / Audio signal transfer using wireless technologies Gasnárek, Jiří January 2012 (has links) Description of construction of analog-to-digital and digital-to-analog convertors for audio signal and distribution via wireless channel, are the objectives of my master's thesis. There are descriptions of DPS construction, design of panels and measurement of system parameters in the project, above all sampling and reconstruction of audio signal, power consumption and signal range of wireless modules. At the end is discussed real usage and suggestions for further developement.
97	Programovatelná umělá zátěž / Programmable load Koleček, Jan January 2016 (has links) The diploma thesis deals with the design of a programmable load. As first, the research of available commercial devices was made in the theoretical part. Based on this research, the design possibilities of programmable load were discussed. As next, the design of resistor network was made, using a computer program that was developed for this purpose. Practical part deals with a realization of module of load, control board and software development. Proposed system consists of control board and ten modules. Modules have floating input terminals. This approach facilitate to arbitrary combination of their inputs. Modules are designed to work with DC and AC power supplies.
98	Počítačové řízení klimatické komory / Computerized Climatic Test Chamber Control Pálka, Václav January 2017 (has links) Diplom work describes a proposal and the design of the device for controlling the temperature test in a climatic chamber Heraeus and the creation of software for operating equipment. Work describes in detail the design and construction interface for the climate chamber, with which will be able to run automated test sequences and the development of the firmware and the operating software to start the temperature test.
99	Design of a High Speed Mixed Signal CMOS Mutliplying Circuit Bartholomew, David Ray 12 March 2004 (has links) (PDF) This thesis presents the design of a mixed-signal CMOS multiplier implemented with short-channel PMOS transistors. The multiplier presented here forms the product of a differential input voltage and a five-bit digital code. A TSMC 0.18 µm MOSFET model is used to simulate the circuit in Cadence Design Systems. The research presented in this thesis reveals a configuration that allows the multiplier to run at a speed of 8.2 GHz with end-point nonlinearity less than 5%. The high speed and low nonlinearity make this circuit ideal for applications such as filtering and digital to analog conversion. design high speed mixed-signal CMOS mutliplier circuit circuit design short-channel PMOS transistors MOSFET Cadence Design Systems nonlinearity filtering digital to analog conversion linear equalization short-channel effects Electrical and Computer Engineering
100	STUDIES ON HIGH-SPEED DIGITAL-TO-ANALOG CONVERSION Balasubramanian, Sidharth January 2013 (has links) No description available. Electrical Engineering

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