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Dissertations / Theses on the topic 'Variable gain power amplifier'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

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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2

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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3

Oder, Stephen, Paula Arinello, Peter Caron, Scott Crawford, Stephen McGoldrick, and Douglas Bajgot. "Development of a Variable Output Power, High Efficiency Programmable Telemetry Transmitter Using GaN Amplifier Technology." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581842.

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Cobham Electronic Systems, Inc. has developed a field-programmable telemetry transmitter module for higher-power (0.1W to 25W) airborne telemetry applications. A key feature of the transmitter is high DC to RF conversion efficiency over the entire variable output power range of 25dB through the use of GaN amplifiers. This high efficiency is realized by using a variable voltage DC-DC converter and dynamic bias control of the GaN amplifier elements. This feature is useful in that output power can be tailored to mission requirements and timelines, thereby extending battery life and increasing ope

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4

Huang, Yan-Yu. "CMOS-based amplitude and phase control circuits designed for multi-standard wireless communication systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44908.

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Designing CMOS linear transmitter front-end, specially the power amplifiers (PAs), in multi-band wireless transceivers is a major challenge for the single-chip integration of a CMOS radio. In some of the linear PA systems, for example, polar- or predistortion-PA system, amplitude and phase control circuits are used to suppress the distortion produces by the PA core. The requirements of these controlling circuits are much different from their conventional role in a receiver or a phase array system. In this dissertation, the special design issues will be addressed, and the circuit topologies of

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5

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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6

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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7

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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8

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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9

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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10

Li, Lisha. "High Gain Low Power Operational Amplifier Design and Compensation Techniques." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1701.pdf.

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11

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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12

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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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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Zhang, Xiaolang. "A programmable-gain amplifier and an active inductor for in-vehicle power line communications." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37014.

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In-vehicle power-line communication (VPLC) is a communication technique that uses the power lines of the vehicle for data transmission. Based on the measurements of the power line communication channel, the channel response is characterized as frequency selective, time and location dependent with high signal attenuation. Also, the access impedance changes a lot in different frequency ranges. These properties impose design challenges at both system level and circuit levels of a VPLC system. This thesis presents the design of two critical building blocks of a VPLC system, namely, a variable gain

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Singh, Rishi Pratap. "A High-Gain, Low-Power CMOS Operational Amplifier Using Composite Cascode Stage in the Subthreshold Region." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2510.

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This thesis demonstrates that the composite cascode differential stage, operating in the subthreshold region, can form the basis of a high gain (113 dB) and low-power op amp (28.1 µW). The circuit can be fabricated without adding a compensation capacitance. The advantages of this architecture include high voltage gain, low bandwidth, low harmonic distortion, low quiescent current and power, and small chip area. These advantages suggest that this design might be well-suited for biomedical applications where low power, low noise bio-signal amplifiers capable of amplifying signals in the milliher

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Hasan, Md Naimul. "A Compact Low Power Bio-Signal Amplifier with Extended Linear Operation Range." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1358074945.

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17

Paro, Filho Pedro Emiliano. "A variable-gain transimpedance amplifier for MEMS-based oscillators = Um amplificador de transimpedância de ganho variável para aplicação em osciladores baseados em MEMS." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259292.

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Orientador: José Alexandre Diniz<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-20T16:11:38Z (GMT). No. of bitstreams: 1 ParoFilho_PedroEmiliano_M.pdf: 39204453 bytes, checksum: 8ea6c789b126029d1ff5b579bdd25102 (MD5) Previous issue date: 2012<br>Resumo: Um amplificador de transimpedância (TIA) de ganho variável é apresentado. Implementado em tecnologia 0,18 'mi'm, o projeto relatado possui a finalidade de prover um amplificador de sustentação para osciladores baseados em ressonadores do ti

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18

Khan, Abbas. "Optimization through Co-Simulation of Antenna, Bandpass Filter and Low-Noise Amplifier at 6-9 GHz." Thesis, Linköpings universitet, Fysik och elektroteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-110575.

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Ultra-wide band (UWB) 6-9 GHz antenna, band pass filter and low-noise amplifier (LNA) optimization using co-simulation of the RF front-end. At higher frequencies, carefully conducted design methodologies are required for RF front-end parameter optimization, such as power gain and low noise figure with low power consumption.

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Altuntas, Mehmet. "Mmic Vector Modulator Design." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605684/index.pdf.

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In this thesis the design of a MMIC vector modulator operating in 9GHz-10GHz band is investigated and performed. Sub-sections of the vector modulator are 4-port (4.8dB) 1200 phase shift relative to the dedicated port power splitter, digitally controlled variable gain amplifier and the in phase power combiner. Alternative methods are searched in order to implement the structure properly in the given frequency band. The final design is appropriate for MMIC structure. 4-port (4.8dB) 1200 phase shift relative to the dedicated port power splitter is studied. The performance is simulated and optim

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Padovan, Fabio. "Analysis and design of high performance building blocks for phased array system in BiCMOS technology." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424338.

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Phased array systems are spreading a lot in these years due to their higher performances respect to a single antenna. These systems have been progressively more and more employedin many fields such as satellite communications, high data rate links (emerging 5G technology), military and automotive radars. Initially they where only used for military applicationsdue to their higher costs and complexity. Thanks to the technology development and the researchers efforts, these days it is possible to integrate on the same chip an entire phased array system, leading to a drastic cost reduction. The ex

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Ryšavý, Jindřich. "Předzesilovač pro MEMS mikrofon." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242074.

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Thesis discusses the possibility of using MEMS microphones in measuring systems. Describes the characteristics of MEMS components and shows possible realization of analog to digital signal convertor when a microphone with analog output is used. Design of the amplifier is made with respect to low noise and low power consumption. Also is shown the possibility of using antialliasing filter as microphone frequency response correction at the same time.

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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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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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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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Hsiao, Chih-Jen, and 蕭智仁. "Implementation of 1.8/2.4GHz Variable Gain Power Amplifier with Power Switch Embedded." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/89967369452414425058.

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碩士<br>國立高雄應用科技大學<br>電機工程系碩士班<br>93<br>This thesis researches on 1.8/2.4GHz variable gain power amplifier with power switch embedded. The chip is fabricated in UMC standard 0.18um 1P6M CMOS process. After measuring, the chip at frequency 1.8GHz exhibits an input return loss of 11.4dB, output return loss of 12.6dB, gain of 20.8dB, output P1dB of 5.8dBm, OIP3 of 15.4dBm, maximum output power of 4.62dBm, PAE(Power Added Efficiency) of 5.7% and variable gain range of 13.2dB to 20.8dB. On the other hand, the chip at frequency 2.4GHz exhibits an input return loss of 11.7dB, output return loss of 13.4

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Chu-YunYang and 楊楚昀. "Design of K-band CMOS Low-Noise, Power Amplifier and 60-GHz Millimeter-Wave Variable Gain Amplifier." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/11564077277691488506.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>98<br>This thesis presents the design of 24- and 60-GHz CMOS amplifier RFICs for millimeter-wave communication applications. The designed RFICs are fabricated with TSMC CMOS 0.18 μm and 90-nm standard processes, respectively. At first for the Ka-band amplifier design, a 15 - 22 GHz wideband CMOS low noise amplifier (LNA), 24-GHz high-efficiency power amplifier (PA), and 18-25 GHz wideband CMOS power amplifier are presented. The simulation and measurement results are compared and discussed. Secondly, a 60-GHz 90-nm CMOS variable gain amplifier (VGA) is presented

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Chun-HanYu and 余俊翰. "Millimeter-Wave CMOS Wideband Variable-Gain Low-Noise Amplifier and 94-GHz CMOS Power Amplifier with Built-in Pre-distortion Linearizer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/bed8pa.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>102<br>This thesis presents the research on millimeter-wave (MMW) CMOS wideband variable-gain low-noise amplifiers (VG-LNAs) and a 94-GHz CMOS power amplifier (PA) with built-in pre-distortion linearizer, implemented by standard TSMC 0.18-μm or 90-nm GUTM CMOS process. To obtaine wideband frequency response, the resistive-feedback skill with additional passive components is used as the matching network. In the 60-GHz VG-LNA design, a gain boosting inductor is used in order to obtain a better gain performance. In 94-GHz CMOS PA design, a four stage CS cascade stru

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Hsieh, Chi-Song, and 謝其松. "Novel Low-Voltage Low-Power Exponential Circuits and Variable Gain Amplifiers (VGA)." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/59541005797916039795.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>90<br>Two novel ultra-low-voltage (ULV) low-power (LP) variable gain amplifiers (VGA) are presented in this paper. These amplifiers based on complementary MOS transistors operating in weak inversion region are composed of pseudo-exponential current-to-current converters and analog multipliers. The gain of the amplifiers can be controlled by an exponential function circuit. The proposed circuits have been verified with the 0.25μm CMOS technology by HSPICE simulations. The simulation results confirm the feasibility of the proposed VGAs.

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Lu, Yu-Cheng, and 盧昱程. "The Circuit Design of A Power Efficient Variable Gain Buffer Amplifier And Reconfigurable Dual Channel Analog Front-End for Biomedical Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/yhqfd4.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>106<br>This thesis presents the design of power-efficient dual channel analog front-end (AFE) circuits for biomedical applications based on floating-gate programming technologies. The circuits in each channel of the analog front-end include a low noise amplifier (LNA), a variable gain amplifier (VGA), two reconfigurable biquadratic filter sections, and a buffer amplifier (BA). Floating-gate transistors are employed to implement programmable current sources, common-mode feedback, and programmable linear pseudo resistors, achieving low noise and high linearity with low

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Ghosal, Kaushik. "Power Scaling Mechanism for Low Power Wireless Receivers." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3767.

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LOW power operation for wireless radio receivers has been gaining importance lately on account of the recent spurt of growth in the usage of ubiquitous embedded mobile devices. These devices are becoming relevant in all domains of human influence. In most cases battery life for these devices continue to be an us-age bottleneck as energy storage techniques have not kept pace with the growing demand of such mobile computing devices. Many applications of these radios have limitations on recharge cycle, i.e. the radio needs to last out of a battery for long duration. This will specially be true fo

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Ghosal, Kaushik. "Power Scaling Mechanism for Low Power Wireless Receivers." Thesis, 2015. http://etd.iisc.ernet.in/2005/3767.

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LOW power operation for wireless radio receivers has been gaining importance lately on account of the recent spurt of growth in the usage of ubiquitous embedded mobile devices. These devices are becoming relevant in all domains of human influence. In most cases battery life for these devices continue to be an us-age bottleneck as energy storage techniques have not kept pace with the growing demand of such mobile computing devices. Many applications of these radios have limitations on recharge cycle, i.e. the radio needs to last out of a battery for long duration. This will specially be true fo

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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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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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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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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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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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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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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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OJHA, RAM MOHAN. "DESIGN OF HIGH GAIN LOW POWER AMPLIFIER." Thesis, 2012. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14145.

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The analog electronics circuits have been developed much better from the past few decades. The design of analog amplifier has become the field of attraction due to various changes in technology. Amplifier circuits are analog circuit which can be used anywhere in houses like in electronic appliances. A variety of these devices such as Operational Amplifier, Fully Differential Amplifier, Current Feedback and Current Conveyors are spread all over in the integration of such electronic devices. In analog processing system Operational Amplifier is considered as a key element. A CMOS single output t

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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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Hsieh, Chia-Yu, and 謝家瑜. "Design of 60-GHz Buffer Amplifier and Low Phase Variation Variable Gain Amplifier." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/76843822133276427501.

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碩士<br>臺灣大學<br>電信工程學研究所<br>98<br>According to the progress of communication techniques and process technologies, wireless communication and high data-rate transmissions become the trend of developments. Recently, 60 GHz becomes a more important developed frequency band, since it is an unlicensed band for application of WPAN, which can provide the secure and efficient short-distant transmission. On the other hand, in process technologies, because of the advantages of high integration potential, low cost and low power in CMOS, it gradually replaces other process to become a major process to reali

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Hsieh, Yu Da, and 謝育達. "Design of Low Noise Amplifier and Variable Gain Amplifier for Multi-band Application." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/19093566999512238335.

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碩士<br>長庚大學<br>電子工程學系<br>100<br>This thesis investigates on the “Design of Low Noise Amplifier and Variable Gain Amplifier for Multi-band Application”. In the future, we will integrate the multi-band LNA and VGA with the front-end receiver. The completion can be used in the 1.8/1.9/2.4/3.5/5/5.8GHz RF transceiver. The ultimate goal is to integrate the transceiver circuit into a single wafer to benefit the integration of the base-band circuit and to realize the manufacture of SoC (System on a Chip). In this thesis, LNA input return losses are smaller than those of -9 to -10dB. Output return loss

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Chang, Yu-Chen, and 張佑丞. "High Power Audio Amplifier with Variable Power Supply." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u285tg.

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博士<br>國立臺灣科技大學<br>電子工程系<br>105<br>Conventional audio power amplifiers are operating with fixed power supply. It means that the power losses caused by quiescent current are also fixed and regardless to output power. When power amplifier working in low power condition, the voltage across power devices will be larger than high power condition such that the losses on power devices increase. This dissertation presents an audio power amplifier with variable power supply controlled by input audio signal. In low-power output condition, the power supply will provide low voltage to reduce the power loss

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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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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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Lu, De-Ren, and 盧德任. "Research on Millimeter-Wave Low-phase-variation Variable-gain Amplifier and Low-noise Amplifier." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/83910802420622187767.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>100<br>As the progress of communication techniques and the advance in process technology, the interest in the millimeter-wave band has rapidly grown since the wide bandwidth allows high data transferring rate for short-range wireless applications. In this thesis, a low noise amplifier (LNA) and a variable-gain amplifier (VGA) are implemented in CMOS technology for W-band and V-band, respectively. In the first part, the W-band LNA, which is an essential component in the receiver, has been designed by TSMC 65-nm 1P9M CMOS process. The circuit is implemented by 4-sta

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Chang, Yu-Cheng, and 張佑誠. "Design of Wideband Power Amplifier with Gain Control." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/36601877257000234299.

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碩士<br>逢甲大學<br>電子工程所<br>91<br>The thesis is to design and implement the Wide Band Power Amplifier with Gain Control in MMIC (Monolithic Microwave Integrated Circuit) which will satisfy the standard of IEEE 802.11 b in ISM（Industrial Scientific and Medical） band. The operating DC power supply is 3 V. We use simulation tool ADS 2002 （Advance Design System 2002） from Agilent corporation to simulate and analyze the circuits. The models of InGaP/GaAs Power HBT, resistor, capacitance, and inductance are given by GCTC（Global Communication Technology Corporation）. Layout software will use Cadence Virtu

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Chen, Jhih-bin, and 陳志彬. "Design of Variable Gain Low Noise Amplifier for IEEE 802.11a Application." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/824urv.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>The IEEE 802.11a has become the mainstream protocol used in modern wireless communication system due to its high propagation rate of data (54 Mb/s). In order to keep RF receiver to operate at linear region under receiving strong signal, the gain of low noise amplifier must be tunable to avoid influencing the subsequent block. Traditional variable gain low noise amplifier is mainly adopted in cascade. Owing to the cascade includes amplifier, attenuator and buffer stages, the more complexity and power consumption increased. This thesis utilizes dual st

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YAN, LIU GUANG, and 劉光硯. "Implementation of Digital control Variable Gain Amplifier using Feedback Block Diagram." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/20033866785725962660.

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碩士<br>中華大學<br>電機工程學系碩士班<br>102<br>This thesis design a Digital control Variable Gain Amplifier be based on the CMOS current mirror and improve the linear gain by using the feedback and Pade approximation. Finally, 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 0.18μm CMOS process. In this thesis, the simulated result is based on the input range of -10μA to 10μA, the power supply of 1.8V, the linear gain range is 53dB and 63dB, the linear error within ±1dB and ±1.5dB, the bandwidth is 137MH

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