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Dissertations / Theses on the topic 'Amplificateur à gain variable'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

Fechine, Sette Elmo Luiz. "Circuits intégrés millimétriques en bande Ka pour une antenne à pointage électronique pour les télécommunications avec des satellites géostationnaires ou des constellations de satellites." Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0002.

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Ce travail présente la conception de circuits actifs intégrés en vue d'une intégration dans une antenne à dépointage électronique pour les télécommunications par satellite en bande Ka. Tout d'abord, le manuscrit présente le contexte dans lequel se déroule l'étude, abordant les principaux concepts et caractéristiques de ce type d'antenne. Par la suite, deux blocs clés de la chaîne d’émission sont étudiés en détail et conçus : un amplificateur de puissance à gain variable et trois déphaseurs pilotables. Les circuits sont réalisés en utilisant deux technologies SiGe BiCMOS: BiCMOS9MW et SG13G2. E

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2

Deza, Julien. "Etude, Conception et Caractérisation de circuits pour la Conversion Analogique Numérique à très hautes performances en technologie TBH InP 0.7µm." Thesis, Cergy-Pontoise, 2013. http://www.theses.fr/2013CERG0680/document.

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Ce travail de thèse concerne les circuits ultra-rapides pour la conversion analogique numérique performante en technologie bipolaire à hétérojonctions sur substrat Indium Phosphore (TBDH/InP). L'étude s'intéresse à la fonction principale qui est l'échantillonnage blocage. Elle a été menée par simulation de l'ensemble des blocs composant cette fonction. En particulier une étude extensive des cœurs des circuits Echantillonneurs/Bloqueurs a été effectuée pour différents paramètres électriques pour aboutir à des valeurs optimales réalisant un compromis entre la bande passante la résolution et la l

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3

Haghighitalab, Delaram. "Récepteur radio-logicielle hautement numérisé." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066443.

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Aujourd'hui, il y a une augmentation du nombre de normes étant intégré dans des appareils mobiles. Les problèmes principaux sont la durée de vie de la batterie et la taille de l'appareil. L'idée d'un Radio-Logiciel est de pousser le processus de numérisation aussi près que possible de l'antenne. Dans cette thèse, nous présentons la première mise en œuvre d'un récepteur radio-logiciel complet basé sur Sigma-Delta RF passe-bande, y compris un LNA à gain variable (VGLNA), un ADC Sigma-Delta RF sous-échantillonné, un mélangeur bas-conversion RF numérique et un filtre de décimation polyphasé multi-

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Haghighitalab, Delaram. "Récepteur radio-logicielle hautement numérisé." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066443.

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Aujourd'hui, il y a une augmentation du nombre de normes étant intégré dans des appareils mobiles. Les problèmes principaux sont la durée de vie de la batterie et la taille de l'appareil. L'idée d'un Radio-Logiciel est de pousser le processus de numérisation aussi près que possible de l'antenne. Dans cette thèse, nous présentons la première mise en œuvre d'un récepteur radio-logiciel complet basé sur Sigma-Delta RF passe-bande, y compris un LNA à gain variable (VGLNA), un ADC Sigma-Delta RF sous-échantillonné, un mélangeur bas-conversion RF numérique et un filtre de décimation polyphasé multi-

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5

Dasgupta, Abhijeet. "High efficiency S-Band vector power modulator design using GaN technology." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0021/document.

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L’évolution des systèmes de télécommunications, liée à une demande sans cesse croissante en termes de débit et de volume de données, se concrétise par le développement de systèmes proposant des bandes passantes très larges, des modulations à très hautes efficacités spectrales, de la flexibilité en puissance et en fréquence d’émission. Par ailleurs, la mise en œuvre de ces dispositifs doit se faire avec un souci permanent d’économie d’énergie d’où la problématique récurrente de l’amplification de puissance RF qui consiste à allier au mieux rendement, linéarité et bande passante. L’architecture

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6

Ayad, Mohammed. "Etude et Conception d’amplificateurs DOHERTY GaN en technologie Quasi - MMIC en bande C." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0027.

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Ce travail répond à un besoin industriel accru en termes d’amplification des signaux sur porteuses à enveloppes variables utilisés par les systèmes de télécommunications actuels. Ces signaux disposent d’un fort PAPR et d’une distribution statistique d’enveloppe centrée en-deçà de la valeur crête d’enveloppe. La raison pour laquelle les industriels télécoms requièrent alors des amplificateurs de très fortes puissances de sortie, robustes, fiables et ayant une dépense énergétique optimale le long de la dynamique d’enveloppe associée à un niveau de linéarité acceptable. Ce document expose les rés

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7

Lablonde, Laurent. "Etude des non-linéarites de gain d'un amplificateur optique à semi-conducteur." Limoges, 1996. http://www.theses.fr/1996LIMO0029.

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Les non-linearites de gain d'un amplificateur optique a semi-conducteurs interviennent negativement ou positivement dans les reseaux de telecommunications optiques. Nous presentons dans ce memoire l'etude de ces non-linearites et des configurations permettant de les reduire ou de les exploiter selon l'orientation souhaitee. Un signal d'intensite saturante peut etre particulierement distordu a l'amplification lorsque sa variation d'intensite est au moins du meme ordre de grandeur que le temps de vie des porteurs de la zone active. La reduction du contraste et la derive frequentielle en sont les

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8

Oksasoglu, Ali 1960. "GAIN-BANDWIDTH EFFECTS IN THE STATE-VARIABLE FILTERS." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276419.

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9

Rahmatian, Behnoosh. "A 75-dB digitally programmable CMOS variable gain amplifier." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/32248.

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A 75-dB DIGITALLY PROGRAMMABLE CMOS VARIABLE GAIN AMPLIFIER Variable-gain amplifiers (VGAs) are essential building blocks of many communication systems. In this thesis, a monolithic low-power digitally programmable VGA with 75dB of gain range is presented. The VGA is targeted for power line communication systems in particular for automotive application; however, it is a generic block that can be use in other applications. The core of the design is based on the low-distortion source-degenerated differential amplifier structure. A gm-boosting circuit is also used to provide higher gain and

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10

Jha, Nand Kishore. "Design of a complementary silicon-germanium variable gain amplifier." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24614.

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11

Moreau, Aurélie. "Réseaux de Bragg intracavité en milieu amplificateur." Phd thesis, Télécom ParisTech, 2006. http://pastel.archives-ouvertes.fr/pastel-00001975.

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Les réseaux de diffraction sont largement utilisés dans le traitement optique de l'information. Toutefois, les applications nécessitent des efficacités de diffraction importantes, d'excellentes résolutions dans le domaine des fréquences spatiales et des temps de réponses appropriés à la fonction recherchée (grande durée de vie pour les mémoires, temps de réponses rapide pour les opérations de traitements de l'information...). Ces qualités étant difficiles à obtenir à l'aide des matériaux existants, une solution consiste à placer le matériau non-linéaire à l'intérieur d'une cavité Fabry-Pérot,

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12

Krishnanji, Sivasankari. "Design of a variable gain amplifier for an ultrawideband receiver." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2576.

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A fully differential CMOS variable gain amplifier (VGA) has been designed for an ultra-wideband receiver. The VGA comprises of two variable gain stages followed by a post amplifier stage. The interface between the digital control block and the analog VGA is formed by a digital-to-analog converter and an exponential voltage generator. The gain of the VGA varies dB-linearly from 0 to 52 dB with respect to the control voltage. The VGA is operated in open loop with a bandwidth greater than 500 MHz throughout the gain range to cater to the requirements of the ultra-wideband system. The noise-to-pow

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13

Bohémond, Christian. "Mélangeur de signaux hyperfréquences basé sur la modulation croisée du gain d’un amplificateur optique à semi-conducteurs." Brest, 2010. http://www.theses.fr/2010BRES2023.

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L’amplificateur optique à semi-conducteurs (SOA) est désormais un composant multifonctiormel capable d’intégrer une liaison opto-hyperfréquence et de réaliser des fonctions tout-optiques. Dans cette étude, nous utilisons le SOA comme convertisseur de signaux hyperfréquences (HP) en exploitant la modulation croisée de son gain (XGM). Deux architectures ont été étudiées : tout d’abord le SOA a été utilisé comme mélangeur tout-optique et ensuite comme mélangeur électro-optique. Cette étude est réalisée à la fois expérimentalement sur un banc de mesures, théoriquement à partir d’équations petit-si

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14

Feng, Mabel Y. "Frequency translation method for low frequency variable gain amplification and filtering." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41642.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (leaves 75-78).<br>This thesis discusses an innovative solution to an industry challenge. A frequency translation method is designed to shift low frequency signals to intermediate frequencies in order to utilize higher-frequency components. This solution, appropriate for applications involving 1-10MHz signals, can provide continuously variable gain and filtering at little cost in dynamic performance. The working system converts the low freq

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15

Diab-el-Arab, Hilda. "Conception et réalisation d'un filtre actif de type RC utilisant un amplificateur de gain fini en technologie MMIC." Paris 11, 2001. http://www.theses.fr/2001PA112330.

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Ce travail traite de la conception de filtres analogiques utilisant des amplificateurs de tension. Cette étude résulte de la transposition aux fréquences micro-ondes des principes utilisés aux basses fréquences. D'abord nous avons étudié le filtre dans sa structure générale pour en déduire une structure optimale. En choisissant judicieusement les valeurs des éléments passifs de cette dernière, nous pouvons réaliser un filtre passe-bande stable, accordable et facile à intégrer dans d'autres cellules élémentaire. De plus, nous avons étudié la non-idéalité de l'amplificateur sur les performances

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16

Lo, Keng Wai. "Wideband active-balun variable-gain low-noise amplifier for mobile-TV applications." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2148237.

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17

De, Souza Marcelo. "Conception d'amplificateur faible bruit reconfigurable en technologie CMOS pour applications de type radio adaptative." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0295/document.

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Les systèmes de communication mobiles permettent l’utilisation de l’information en environnements complexes grâce à des dispositifs portables qui ont comme principale restriction la durée de leurs batteries. Des nombreux efforts se sont focalisés sur la réduction de la consommation d’énergie des circuits électroniques de ces systèmes, une fois que le développent des technologies des batteries ne avance pas au rythme nécessaire. En outre, les systèmes RF sont généralement conçus pour fonctionner de manière fixe, spécifiés pour le pire cas du lien de communication. Toutefois, ce scénario peut se

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18

Ehteshamuddin, Mohammed. "Design of a High Temperature GaN-Based Variable Gain Amplifier for Downhole Communications." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/74958.

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The decline of easily accessible reserves pushes the oil and gas industry to explore deeper wells, where the ambient temperature often exceeds 210 °C. The need for high temperature operation, combined with the need for real-time data logging has created a growing demand for robust, high temperature RF electronics. This thesis presents the design of an intermediate frequency (IF) variable gain amplifier (VGA) for downhole communications, which can operate up to an ambient temperature of 230 °C. The proposed VGA is designed using 0.25 μm GaN on SiC high electron mobility transistor (HEMT) techno

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19

Richard, Gaetan C., and Daniel G. Gonzales. "A NEW VARIABLE BEAMWIDTH ANTENNA FOR TELEMETRY TRACKING SYSTEMS." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608402.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada<br>This paper presents a new variable beamwidth antenna designed for use in telemetry tracking systems when a high gain/low gain antenna configuration is required. This antenna can be commanded to continuously vary its beamwidth between a high gain/narrow beamwidth mode of operation and a low gain/ wide beamwidth mode of operation. A design goal of a 4:1 increase in beamwidth has been set and a 3.0:1 increase has been achieved without causing any significant degradation in t

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20

Al-Sweiti, Yousef M. "Modeling and control of an elastic ship mounted crane using variable gain model based controller." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980984157.

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21

Chen, Lin. "A low power, high dynamic-range, broadband variable gain amplifier for an ultra wideband receiver." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5843.

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A fully differential Complementary Metal-Oxide Semiconductor (CMOS) Variable Gain Amplifier (VGA) consisting of complementary differential pairs with source degeneration, a current gain stage with programmable current mirror, and resistor loads is designed for high frequency and low power communication applications, such as an Ultra Wideband (UWB) receiver system. The gain can be programmed from 0dB to 42dB in 2dB increments with -3dB bandwidth greater than 425MHz for the entire range of gain. The 3rd-order intercept point (IIP3) is above -13.6dBm for 1Vpp differential input and output voltage

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22

Amaya, Mohammad. "Amélioration des performances d'un amplificateur optique à semi-conducteurs par injection optique à la transparence du gain pour les réseaux de télécommunications optiques." Brest, 2006. http://www.theses.fr/2006BRES2025.

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L'amplificateur optique à semi-conducteurs (SOA) est un composant attractif pour les futurs réseaux de télécommunications tout-optiques multicolores métropolitains. Ce travail présente une étude théorique et expérimentale des performances statiques et dynamiques d'un SOA, lors de l'injection optique à la transparence du gain dans sa zone active dans l'objectif d'établir les effets intéressants de cette technique. Nos travaux ont montrée que la pompe optique apporte une amélioration importante en terme de la puissance de saturation de sortie, de la durée de vie des porteurs et du temps de récup

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23

Azmat, Rehan. "Design and implementation of a low-noise high-linearity variable gain amplifier for high speed transceivers." Thesis, Linköpings universitet, Elektroniksystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-73449.

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The variable gain amplifier (VGA) is utilized in various applications of remote sensing and communication equipments. Applications of the variable gain amplifier (VGA) include radar, ultrasound, wireless communication and even speech analysis. These applications use the variable gain amplifier (VGA) to enhance dynamic performance. The purpose of the thesis work is to implement a high linearity and low noise variable gain amplifier in 150 nm CMOS technology, for an analog-front-end of a transceiver. Two different amplifier architectures are designed and compared. First architecture is an amplif

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Mitra, Dipankar. "A Variable High Gain and High Dynamics Range CMOS Phase Shifter for Phased Array Antenna Applications." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28033.

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Phase shifters can adjust phases electronically and hence is very popular for phased array antenna applications where radiation angle can be scanned electronically avoiding bulky mechanical rotation arrangement. In this research a variable gain phase shifter was investigated, capable of controlling precisely both phase and gain simultaneously. The phase shifter was fabricated using 0.18um CMOS process and the measured results showed continuous phase shift of 3030 with 9-dB variable gain at 3.5 GHz. Based on the measured results, a modified phase shifter was proposed and designed which can achi

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25

Zhou, Hao. "Numerical Investigation of the Nonlinear Dynamics of a Hybrid Acousto-Optic Bragg Cell with a Variable Feedback Gain." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406666390.

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26

Mimeche, Naamane. "Conception assistée par ordinateur de circuits translinéaires analogiques à gain controlé et applications au filtrage." Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0343.

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Plusieurs configurations pour des circuits miroirs de courant avec courant de sortie contrôlé en courant sont comparées. Les circuits convoyeurs de courant à gain contrôlé du premier et du second type qui s'en déduisent permettent la réalisation d'amplificateurs contrôlés et de filtres réglables. Deux exemples sont étudiés. Divers circuits amplificateurs opérationnels de transconductance (OTA) avec courants de sortie en opposition de phase, mis en œuvre à partir d'éléments translinéaires, sont étudiés et comparés à la réalisation conventionnelle. Un macromodèle amélioré relatif à ces circuits,

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Häkkinen, J. (Juha). "Integrated RF building blocks for base station applications." Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:951426908X.

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Abstract This thesis studies the level of performance achievable using today's standard IC processes in the integrated RF subcircuits of the modern GSM base station. The thesis concentrates on those circuit functions, i.e. I/Q modulators, variable gain amplifiers and frequency synthesizers, most relevant for integration in the base station environment as pinpointed by studying the receiver/transmitter architectures available today. Several RF integrated circuits have been designed, fabricated and their level of performance measured. All main circuits were fabricated in a standard double-metal

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PATEL, PRERNA D. "DESIGN OF A PIXEL SCALE OPTICAL POWER METER SUITABLE FOR INCORPORATION IN A MULTI-TECHNOLOGY FPGA." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1066421274.

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Lind, Fredrik, and Escalante Andrés Diaz. "Maximizing performance gain of Variable Rate Shading tier 2 while maintaining image quality : Using post processing effects to mask image degradation." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21868.

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Background. Performance optimization is of great importance for games as it constrains the possibilities of content or complexity of systems. Modern games support high resolution rendering but higher resolutions require more pixels to be computed and solutions are needed to reduce this workload. Currently used methods include uniformly lowering the shading rates across the whole screen to reduce the amount of pixels needing computation. Variable Rate Shading is a new hardware supported technique with several functionality tiers. Tier 1 is similar to previous methods in that it lowers the shadi

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Chen, Yun-ju, and 陳韻如. "Design of CMOS Variable Gain Amplifier." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47315197247618226962.

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碩士<br>逢甲大學<br>電子工程所<br>97<br>A CMOS variable gain amplifier （VGA） is presented, which consists of exponential control circuit, amplifier circuit and buffer circuit. The exponential control circuit adopts an approximate exponential equation. The amplifier circuit includes a common mode feedback circuit, the common mode feedback is required in order to prevent any of the transistors from entering linear mode operation and to maintain a specific dc value for the biasing of the next stage. The VGA is implemented in 0.35um CMOS technology and total power dissipation is 58mW at 3.3V supply. The chip

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Wu, Wei-ruen, and 吳威潤. "Voltage-Controlled Variable-Gain Optical Receiver." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78197469140607056041.

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碩士<br>國立雲林科技大學<br>電子與資訊工程研究所<br>99<br>A Voltage-controlled variable-gain optical receiver for optical wireless communication is described. Under a photodiode capacitance of 5pF, the transimpedance gain, bandwidth, and power consumption of the optical receiver are 77dBΩ, 103MHz, and 34 mW respectively. A CMOS voltage-control resistor is adopted in the feedback transimpedance amplifier. The receiver is designed and implemented using a 0.35μm 2P4M CMOS technology with 3.3V supply voltage. The final implementation occupies a total area of 825um × 666um.

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Lai, Bing-Jiun, and 賴炳均. "Integrated Radio Frequency Variable Gain Amplifier." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/79487323239286597680.

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碩士<br>國立中正大學<br>電機工程所<br>96<br>The first stage of a receiver is typically a low noise amplifier, whose main features are to provide enough gain and minimize the influence to subsequent stages due to the noise generated in itself. In general, variable gain amplifier is employed for automatic gain control, which is used for automatically adjusting gain of the receiver path, so that the received RF signal can be easily processed by subsequent circuits. The requirements for the tuner front-ends are low power consumption, dB-linear, dynamic range, linearity and gain performance. The first part of t

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Liu, Hung-Hsi, and 劉洪禧. "FPGA implements variable gains control of the variable gain amplifier." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/01974566430523855947.

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碩士<br>中原大學<br>電子工程研究所<br>97<br>Field Programmable Gate Array (FPGA) can be used to implement complex logic function and provide rapid field re-programmable ability in a single chip design application. This thesis describes the use of hardware design language Verilog and the implementation of a variable gain controller in a Variable Gain Amplifier. A top-down methodology is applied in this design to make the design clearer and easier for maintenance. A look up table (LUT) mechanism is applied to realize faster computing and simplify the design complexity. The design is simulated by Modelsim and

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Wang, Lin-Sen, and 王林森. "Designs of CMOS Variable Gain Amplifiers for Wide-Gain-Range Applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/t67e96.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>105<br>Several gain control mechanisms for the design of programmable gain amplifier (PGA) and variable gain amplifier (VGA) are presented in this thesis. In RF wireless receivers, an accurate decibel (dB)-linear PGA or VGA is required to convert the dynamic range of received signal into an acceptable range for the analog-to-digital converter (ADC). Several variable gain amplifier architectures and exponential-approximation functions are discussed and analyzed in this thesis. In order to obtain a wide dB-linear gain range, a cascading gain-error-shifting and a singl

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Ko, Po-Ting, and 柯柏廷. "Designs of CMOS Variable Gain Amplifiers for Low-Gain-Error Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bknnkc.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>107<br>Several gain control mechanisms for the design of programmable gain amplifier (PGA) and variable gain amplifier (VGA) are presented in this thesis. In wireless communication systems, the received signal changes significantly. Therefore, an accurate decibel (dB)-linear PGA or VGA is required to convert the dynamic range of received signal into an acceptable range for the analog-to-digital converter (ADC). Several variable gain amplifier architectures and exponential-approximation functions are discussed and analyzed in this thesis. In order to obtain the chara

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Chen, Hsin-Hao, and 陳信豪. "Variable Gain Amplifier for Ultrasound Imaging Receiver." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/26783570570803995937.

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陳東山. "Radio frequency heterojunctio bipolar transistor variable frequency oscillator and variable gain amplifier." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/93466629235737130612.

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碩士<br>國立中興大學<br>電機工程學系<br>91<br>Fabricated through a GaInP/GaAs HBT technology, a monolithic variable frequency oscillator (VFO) and a monolithic variable gain amplifier (VGA) were measured and reported in this thesis. A number of issues on the VFO and VGA were detailed as well. A new circuitry, called a Variable Impedance Converter (VIC), was adopted to mimic a variable capacitor, which was essentially an important element for frequency tuning in a LC-based oscillator design.A negative-impedance converter not only provides the necessary negative resistance for oscillation, but also

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Liu, Bang-Zhi, and 劉邦志. "Implementation of 6-Bit Digital control Variable Gain Amplifier with High Linear Gain." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/40855833975865745996.

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碩士<br>中華大學<br>電機工程學系碩士班<br>102<br>The propose of this thesis is to design and implement the circuits of a Digital control Variable Gain Amplifier with High Linear Gain. We use HSPICE and MATLAB for circuit simulation and analysis. Circuit layout is used the Laker which provided by CIC. The Chip is fabricated by TSMC 0.18 um CMOS process. 　　In this thesis, the variable gain amplifier is divided into two parts: Amplifier circuit and control circuit. The amplifier circuit is designed by exponential function which approximated by second order Taylor’s polynomial. The control circuit is designed by

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Tsou, Shan-Chih, and 鄒善智. "CMOS Variable Gain Amplifier for Multi-Standard Receiver." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31899508987093420198.

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碩士<br>國立清華大學<br>電機工程學系<br>92<br>With the rapid growth of higher data rate, integrating the analog circuit block with wide bandwidth in the baseband will be an indispensable trend in the future. On the other hand, a single circuit block which can be used for multi-standard receiver is an economic implementation way to enhance the usability of the cell phone. A CMOS variable gain amplifier (VGA) for multi-standard receiver described in this thesis aims to meet these two demands. In general, VGA is controlled by an automatic gain control (AGC) loop. As the data rate increases, the data slot w

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Song, Guang-Fong, and 宋光峰. "The Design of A Variable Gain Instrumentation Amplifier." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/24520553586227143218.

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碩士<br>中原大學<br>電子工程學系<br>87<br>A variable gain instrumentation amplifier (IA) has been designed in this thesis. Buffered two-stage operational amplifier and poly resistors construct the core of the instrumentation amplifier. In order to obtain good amplifier performance, the circuit configuration of the IA and its output stage, the offset and noise effects have been analyzed and investigated in this thesis. We also present key layout methods such as common-centroid structure, dummy device and guard-ring option for differential input transistor pair, compensated capacitor and poly resistors. Ful

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Hu, Yun-Chung, and 胡運忠. "Low Power Variable Gain Amplifier for UWB systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/13040808438308906179.

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碩士<br>中原大學<br>電子工程研究所<br>95<br>The booming development of the wireless communication technology in recent years make the relevant products, such as GSM, CDMA, Bluetooth, 802.11 (Wi-Fi), ZigBee and Ultra wide band (UWB) widely used in our daily life and became important research topics. This thesis proposes a Variable Gain Amplifier (VGA) that is suitable for UWB system. It consists of a main amplifier, gain control circuit, and a common mode feedback loop. The main amplifier is realized by a folded cascode amplifier with feedback and the gain control function is utilized by a source-coupled pa

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Lee, Jun-Yi, and 李俊億. "Design of a variable-gain CMOS Optical Receiver." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03963634580322183010.

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碩士<br>國立雲林科技大學<br>電子與光電工程研究所碩士班<br>100<br>A Voltage-controlled variable-gain optical receiver for optical wireless communication is described. A stable variable-gain fully-differential transimpedance feedback amplifier is designed employing a current-mode amplifier as the feedforward gain element. Using a photodiode capacitance of 5pF, the transimpedance gain, bandwidth, and power consumption of the optical receiver are 98dBΩ, 119MHz, and 88mW respectively. A voltage-control resistor is adopted in the feedback transimpedance amplifier. The receiver is designed and implemented using a 0.35μm 2P

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Chen, Sz-Han, and 陳思涵. "A 1.5-GHz Variable-Gain Amplifier and Filter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3kjgaf.

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碩士<br>國立交通大學<br>電子研究所<br>108<br>For the fifth generation (5G) communication system, we use variable gain amplifier (VGA) to amplifier the baseband signal at receiver and use filter to filter out noise and any other signals which are not in the signal band. After that, we use analog-to-digital converter (ADC) to convert analog signal to digital signal for digital circuits and complete the baseband front-end receiver circuit of the fifth generation communication system. This paper is about VGA and filter. ar Due to the specification of bandwidth is wider in the fifth generation communication sys

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Yang, Hui-Chen, and 楊蕙甄. "A Short-Channel Variable Gain Amplifier with DC Offset Cancellation and Gain Calibration Loop." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/63026791132656734491.

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碩士<br>國立清華大學<br>電機工程學系<br>98<br>In this thesis, a short-channel variable gain amplifier with digital feedback loops is proposed. For the purpose of area saving, the entire work is implemented with minimum gate length CMOS devices. This results in severe circuit process variations. To overcome this problem, two digital feedback loops are needed for the DC offset cancellation and gain calibration. The VGA circuit is based on a fully-differential gain stage with a degeneration resistor network. The resistance of this resistor network is digitally controlled to provide enough gain range and re

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Krstic, Marko. "An Optimized, Variable-Gain Switched-Capacitor DC-DC Converter." Thesis, 2013. http://hdl.handle.net/1974/7868.

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A novel, variable-gain switched-capacitor DC-DC converter is designed, constructed and tested. The proposed converter minimizes many of the problems which have traditionally hindered switched-capacitor DC-DC converters. The converter has high efficiency, strong regulation and low output voltage ripple across a wide variation in the line and load. The converter utilizes an optimized switching configuration that contains the maximum number of ideal conversion ratios for the given number of capacitors driven by a two-phase clock. The switched-capacitor converter is controlled by a gain-hopping fe

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Chen, Chia-Jung, and 陳佳蓉. "Investigation of a variable-gain circuit for hydrogen detector." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/92400931422928360611.

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碩士<br>朝陽科技大學<br>資訊工程系碩士班<br>97<br>In this thesis, a 3×3 gas sensors array with on chip multiple input integrated circuitry by using microelectromechanical system (MEMS) was fabricated. Hydrogen sensors fabricated with different structures can be measured simultaneously. The hydrogen sensing chip has two advantages. First, the structure of the array has a cantilever beam, it can prevent the hot effect. Second the fabrication can consistent with CMOS technology. It’s easy to measure and analysis by using the chip with variable-gain.Traditionally, the hydrogen sensing device and the sensing chip

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Lin, Yi-Chen, and 林宜蓁. "CMOS Dual-Band Constant-IF-Bandwidth Variable Gain Up-Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97256719958668456921.

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碩士<br>國立交通大學<br>電信工程系所<br>96<br>In this thesis, we focus on Radio Frequency Integrated Circuits. We combine IF variable gain amplifier with up-converter by using a new modified V-to-I transconductor stage, therefore, both frequency up-conversion and variable-gain amplification are achieved by using current-mode operation in a single chip. We implement several variable gain up-converter with constant IF bandwidth for WLAN and UWB communication systems by using TSMC 0.18μm CMOS technology and TSMC 0.35μm SiGe BiCMOS technology. Moreover, in order to do multi-band multi-mode signal processing

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Hung, Chia-Cheng, and 洪家正. "A Low Voltage, Variable Gain Design for Low Noise Amplifier." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/15654715837525270170.

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碩士<br>長庚大學<br>電子工程研究所<br>92<br>In the thesis, an integrated RF circuit topology that can be used to realize low voltage ( i.e. 1V ) low noise amplifier is presented. The design technique based on a narrowband LC-folded cascode topology is proposed for low voltage RF integrated circuits. Based on a LC-folded cascode LNA topology, it is implemented with a modified LC-folded cascode LNA configuration using two common source transistors to improve linearity. The linearity is improved about 2 to 3 dB. On LC-folded cascode topology, another merit that only increases in the LNA circuit complex

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Wang, Po-Sheng, and 王柏勝. "Design of Variable-Gain Low-Noise Amplifiers in CMOS Technology." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/46392548950397376660.

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碩士<br>國立中正大學<br>電機工程所<br>98<br>This thesis presents three enhanced CMOS low-noise amplifiers (LNA). First, a differential wideband low-noise amplifier was designed by using a shunt-shunt feedback in 0.18-μm CMOS technology. The measured power gain is 8.1?0.6 dB and noise figure is 3.5?0.3 dB in 2.3–4 GHz. The 3-dB gain bandwidth is 1–4.2 GHz. The input return losses is greater than 10.4 dB. The measured input 1-dB-compressed power is -8.8 dBm and input-referred third-order intercept (IIP3) is 0 dBm at 3 GHz. The power consumption is 19.8 mW from a 1.8 V supply. The second design is a wideb

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洪德儒. "A Variable-Gain 0.35um SiGe 5.25GHz RF Front-End Integrated Circuit." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/66180291387058812835.

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