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Thèses sur le sujet « Amplifiers »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 août 2024

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1

Shao, Jin. "Advanced Power Amplifiers Design for Modern Wireless Communication." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804973/.

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Modern wireless communication systems use spectrally efficient modulation schemes to reach high data rate transmission. These schemes are generally involved with signals with high peak-to-average power ratio (PAPR). Moreover, the development of next generation wireless communication systems requires the power amplifiers to operate over a wide frequency band or multiple frequency bands to support different applications. These wide-band and multi-band solutions will lead to reductions in both the size and cost of the whole system. This dissertation presents several advanced power amplifier solut

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2

Hur, Joonhoi. "A highly linear and efficient out-phasing transmitter for multi-band, multi-mode applications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42823.

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There have been many efforts to improve efficiency of transmitter while meeting stringent linearity requirement of modern communication system. Among the technology to enhance efficiency of linear transmitter, the out-phasing technologies, also called the linear amplification with nonlinear components (LINC), is considered as a promising technology. LINC has been studied long times, since it provides excellent linearity with high efficiency by allowing adopt high efficient switch-mode power amplifiers. However, The LINC transmitter has some technical challenges: linearity degradation due to am

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3

Kim, Moonil. "Grid amplifiers." Diss., Pasadena, Calif. : California Institute of Technology, 1993. http://resolver.caltech.edu/CaltechETD:etd-08292007-104142.

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4

Talli, Giuseppe. "Amplified spontaneous emission and gain dynamics in semiconductor optical amplifiers." Thesis, University of Essex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397730.

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5

Lee, Ockgoo. "High efficiency switching CMOS power amplifiers for wireless communications." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37145.

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High-efficiency performance is one of the most important requirements of power amplifiers (PAs) for wireless applications. However, the design of highly efficient CMOS PAs for watt-level applications is a challenging task. This dissertation focuses on the development of the design method for highly efficient CMOS PAs to overcome the fundamental difficulties presented by CMOS technology. In this dissertation, the design method and analysis for a high-power and highefficiency class-E CMOS PA with a fully integrated transformer have been presented. This work is the first effort to set up a compre

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6

Kunarajah, Enoch Arumaishanth. "Distributed Raman amplifiers." Thesis, University of Essex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399979.

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7

Barradas, Filipe Miguel Esturrenho. "RF parametric amplifiers." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10198.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>Recentemente tem-se feito um esforço no sentido de aumentar a eficiência em aplicadores de RF, no entanto, o transístor é um dispositivo intrinsecamente ineficiente. Utilizando amplificadores paramétricos pode-se teoricamente chegar a 100% de eficiência mesmo operando em modo linear. A razão desta elevada eficiência é o dispositivo activo utilizado, já que os amplificadores paramétricos utilizam uma reactância controlada, que não consome potência. Esta mudança de elemento activo modifica completamente o princípio de funcionamento

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8

Al, Tanany Ahmed. "A Study of Switched Mode Power Amplifiers using LDMOS." Thesis, University of Gävle, Department of Technology and Built Environment, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-701.

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<p>This work focuses on different kinds of Switch Mode Power Amplifiers (SMPAs) using LDMOS technologies. It involves a literature study of different SMPA concepts. Choosing the suitable class that achieves the high efficiency was the base stone of this</p><p>work. A push-pull class J power amplifier (PA) was designed with an integrated LC resonator inside the package using the bondwires and die capacitances. Analysis and motivation of the chosen class is included. Designing the suitable Input/Output printed circuit board (PCB) external circuits (i.e.; BALUN circuit, Matching network and DC</p

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9

Gray, Blake Raymond. "Design of RF and microwave parametric amplifiers and power upconverters." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43613.

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The objective of this research is to develop, characterize, and demonstrate novel parametric architectures capable of wideband operation while maintaining high gain and stability. To begin the study, phase-incoherent upconverting parametric amplifiers will be explored by first developing a set of analytical models describing their achievable gain and efficiency. These models will provide a set of design tools to optimize and evaluate prototype circuit boards. The prototype boards will then be used to demonstrate their achievable gain, bandwidth, efficiency, and stability. Further investiga

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10

Gordienko, Vladimir. "Broadband fibre parametric amplifiers." Thesis, Aston University, 2018. http://publications.aston.ac.uk/37690/.

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This thesis explores the broadband fibre optical parametric amplifiers (FOPAs) to develop the FOPA ability to provide broadband amplification anywhere in the low-loss transmission window and to make FOPA an enabling technology for future ultra-wide bandwidth high-speed optical communications. A number of techniques have been implemented to demonstrate an exceptionally wide and flat FOPA gain of 10.5±0.5 dB over 102 nm bandwidth on a single side of the FOPA pump. A flat gain spectrum is targeted here because FOPA is prone to large gain variation which has a particularly strong negative impact o

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11

Foo, Sik Heng. "Statistical properties of filtered amplified spontaneous emission noise of erbium-doped fiber amplifiers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/MQ47029.pdf.

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12

Kim, Hyun-Woong. "CMOS RF transmitter front-end module for high-power mobile applications." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47592.

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With the explosive growth of the wireless market, the demand for low-cost and highly-integrated radio frequency (RF) transceiver has been increased. Keeping up with this trend, complimentary metal-oxide-semiconductor (CMOS) has been spotlighted by virtue of its superior characteristics. However, there are challenges in achieving this goal, especially designing the transmitter portion. The objective of this research is to demonstrate the feasibility of fully integrated CMOS transmitter module which includes power amplifier (PA) and transmit/receive (T/R) switch by compensating for the intrinsic

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13

Mishra, Chinmaya. "Design and implementation of low power multistage amplifiers and high frequency distributed amplifiers." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2775.

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The advancement in integrated circuit (IC) technology has resulted in scaling down of device sizes and supply voltages without proportionally scaling down the threshold voltage of the MOS transistor. This, coupled with the increasing demand for low power, portable, battery-operated electronic devices, like mobile phones, and laptops provides the impetus for further research towards achieving higher integration on chip and low power consumption. High gain, wide bandwidth amplifiers driving large capacitive loads serve as error amplifiers in low-voltage low drop out regulators in portable device

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14

Cartwright, Justin Adam. "A novel technique for harmonic cancellation in class D amplifiers a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=2&did=1759989201&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1250263495&clientId=28564.

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15

Fedorenko, Pavlo. "Phase distortion in envelope elimination and restoration radio frequency power amplifiers." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34822.

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The objective of this research is to analyze and improve linearity of envelope elimination and restoration (EER) radio frequency (RF) power amplifiers. Envelope elimination and restoration was compared to other efficiency enhancement techniques and determined to likely be the most suitable solution for implementation of multimode, multiband portable RF transmitters. Distortion, stemming from dynamic power-supply modulation of RF transistors in EER RF power amplifiers was identified as one of the key challenges to the development of commercially viable EER transmitters. This dissertation presen

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16

Enz, Christian C. Enz Christian Charles Enz Christian Charles Enz Christian Charles. "High precision CMOS micropower amplifiers /." [S.l.] : [s.n.], 1989. http://library.epfl.ch/theses/?nr=802.

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17

Banerjee, Gaurab. "Desensitized CMOS low noise amplifiers /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6014.

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18

Bell, Patrick J. "MEMS-reconfigurable microwave power amplifiers." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219036.

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19

Lewis, Steffan A. E. "Fibre Raman amplifiers for telecommunications." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288385.

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20

Banyamin, Ben Yovel. "Cascaded single stage distributed amplifiers." Thesis, Brunel University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311244.

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21

Klele, Anthony G. "Noise analysis for analog amplifiers." Honors in the Major Thesis, University of Central Florida, 1993. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/119.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.<br>Bachelors<br>Engineering<br>Electrical Engineering

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22

Toumazou, C. "Universal current-mode analogue amplifiers." Thesis, Oxford Brookes University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372854.

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23

Mander, Gillian Linda. "Quantum theory of laser amplifiers." Thesis, University of Essex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290741.

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24

Rayanakorn, Surapap. "Design of micropower operational amplifiers." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37079.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.<br>Includes bibliographical references (p. 149-151).<br>The operational amplifier is a fundamental building block for electronic devices and systems. The advancement of modern electronic technology has been setting more performance demand on the underlying integrated circuits including the operational amplifier. Reduction in power consumption and improvement in speed are some of the most important requirements. To address these concerns, this thesis presents a design of micropow

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25

Reilly, Mark Alexander. "Integrated polymer waveguide optical amplifiers." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614010.

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26

Zhu, Yanjun. "Novel fibre lasers and amplifiers." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392685.

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27

Cao, Qiusheng. "Planar waveguide CO2 laser amplifiers." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1224.

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28

Mears, Robert Joseph. "Optical fibre lasers and amplifiers." Thesis, University of Southampton, 1987. https://eprints.soton.ac.uk/396453/.

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This thesis describes the development and characterisation of single-mode optical fibre lasers and amplifiers. Although the fibre laser configuration was first employed over twenty years ago, its application to conventional optical fibre technology has not been demonstrated previously. The new devices are based on single-mode fibres doped with rare-earth ions, notably neodymium and erbium. The combination of strong absorption bands, long fluorescence lifetimes; low fibre losses in the infra-red and small fibre cores have made possible very low threshold and efficient fibre lasers. Experiments

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29

Mutha, Shashank. "Adaptive Linearization of Power Amplifiers." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1244049195.

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30

Wen, Pengyue. "Vertical cavity semiconductor optical amplifiers /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3070991.

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31

Wan, Quan. "Design of High Performance Amplifiers." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/294044.

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This dissertation presents circuit techniques for designing high performance amplifiers. In low power design, the range of common mode input signal shrinks due to reduced power supply voltage. In addition, due to reduced bias current, noise density rises. The reduced input signal range and raised noise floor severely degrade system dynamic range. A novel rail to rail input circuit is presented. The proposed circuit has advantages over conventional circuits in term of noise and power consumption. Moreover, due to reduced bias current, low power amplifiers typically have lower bandwidth and slew

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32

An, Kyu Hwan. "CMOS RF power amplifiers for mobile wireless communications." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31717.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Laskar, Joy; Committee Member: Cressler, John; Committee Member: Kohl, Paul; Committee Member: Kornegay, Kevin; Committee Member: Tentzeris, Emmanouil. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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33

Jang, Haedong. "NONLINEAR EMBEDDING FOR HIGH EFFICIENCY RF POWER AMPLIFIER DESIGN AND APPLICATION TO GENERALIZED ASYMMETRIC DOHERTY AMPLIFIERS." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406269587.

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34

Grantham, Clayton Bruce 1955. "A PARAMETRIC STUDY AND REDESIGN OF THE BLAUSCHILD HIGH SPEED INSTRUMENTATION AMPLIFIER ARCHITECTURE." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276494.

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This work contains the analysis and redesign of a translinear circuit. This circuit appeared in the article by Robert Blauschild. The Blauschild circuit was analyzed on H-SPICE, a VAX computer circuit analysis program, with Burr-Brown Integrated Circuit Process 30 models. Circuit improvement to input voltage to current converter stage and circuit simplification of the output stage were implemented and simulated in the redesign. The results of the two simulations were compared, which showed that the improvements were valid and useful. Going through this redesign cycle of circuit analysis, compu

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35

Willstedt, Alexander. "Absolutely amplified : A corpus study of amplifiers, their usage and collocations in two different corpora." Thesis, Linnéuniversitetet, Institutionen för språk (SPR), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45539.

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The purpose of this study is to investigate the usage and frequencies of amplifiers in the English language and whether there are differences in usage, collocations and in gender. The material used is the Swedish-English Corpus (SWENC), a collection of Swedish native speaking journalists writing in English, and the Corpus of American Soaps (SOAP), a collection of American soap opera scripts. The size of the two corpora is quite different and therefore the number of tokens varies largely, but by using normalization, the frequencies have been compared. The results show differences in frequency a

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36

Schmid, Robert L. "Design of a reconfigurable low-noise amplifier in a silicon-germanium process for radar applications." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47642.

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This thesis describes a unique approach of turning on and off transistor cores to reconfigure low-noise amplifiers. A small footprint single-pole, single-throw switch is optimized for low insertion loss and high isolation. A narrowband (non-switchable) LNA is developed as a basis of comparison for reconfigurable designs. The optimized switch is incorporated into different switchable transistor core architectures. These architectures are investigated to determine their ability to reconfigure amplifier performance. One switchable transistor core topology is integrated into a cascode LNA design.

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37

Thipparapu, Naresh Kumar. "Development of bi-doped fibre amplifiers and lasers & broadband Er-doped multi-element fibre amplifiers." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/423478/.

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The demand for fibre optic communication is continuously increasing over the years. This is due to the increased accessibility to the World Wide Web using internet of things. The capacity of current fibre optic communication through the single mode fibre is limited by the amplification bandwidth of Er-doped fibres. To increase the capacity of fibre optic communication research community around the world are proposing different approaches. One of them is to use the low loss window (1260-1625nm) of silica optical fibres by developing efficient fibre amplifiers and lasers. Another one is to use n

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38

Miao, Yingyu. "Advanced overmoded circuits for gyro-amplifiers." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1370.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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39

Al-Tahir, Hibah. "Multidimensional Measurements : on RF Power Amplifiers." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-729.

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<p>Abstract</p><p>In this thesis, a measurement system was set to perform comprehensive measurements on RF power amplifiers. Data obtained from the measurements is then processed mathematically to obtain three dimensional graphs of the basic parameters affected or generated by nonlinearities of the amplifier i.e. gain, efficiency and distortion. Using a class AB amplifier as the DUT, two sets of signals – both swept in power level and frequency - were generated to validate the method, a two-tone signal and a WCDMA signal. The three dimensional plot gives a thorough representation of the behavi

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40

Condo, Neira Edith Graciela. "Multidimensional Measurements on RF Power Amplifiers." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-804.

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<p>Measurements are important to specify and verify properties for components, modules and systems. The specifications for a certain figure of merit are usually given in a numerical value or a two dimensional plot. However, there are some devices, like power amplifiers with certain figure of merits that depends on two or more working conditions, requiring a three dimensional plot.</p><p>This thesis presents a measurement method including graphical user interface of three parameters gain, efficiency and distortion when two-tone or WCDMA signals are used as an input to the PA.</p>

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41

McRory, John Godfrey. "Stacked GaAs FET RF power amplifiers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/NQ31049.pdf.

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42

Austrin, Lars. "On magnetic amplifiers in aircraft applications." Licentiate thesis, Stockholm : Elektrotekniska system, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4439.

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43

Mahdavi, Sareh. "RF power amplifiers and MEMS varactors." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112576.

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This thesis is concerned with the design and implementation of radio frequency (RF) power amplifiers and micro-electromechanical systems---namely MEMS varactors. This is driven by the many wireless communication systems which are constantly moving towards increased integration, better signal quality, and longer battery life.<br>The power amplifier consumes most of the power in a receiver/transmitter system (transceiver), and its output signal is directly transmitted by the antenna without further modification. Thus, optimizing the PA for low power consumption, increased linearity, and compact

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44

Fews, Hayden Scott. "Multiwave mixing in semiconductor optical amplifiers." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300912.

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45

Chestnut, David Alexander. "Fibre lasers and amplifiers with nonlinearity." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410006.

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46

Hall, Fenella T. H. "Mathematical models for class-D amplifiers." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11891/.

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We here analyse a number of class-D amplifier topologies. Class-D amplifiers operate by converting an audio input signal into a high-frequency square wave output, whose lower-frequency components can accurately reproduce the input. Their high power efficiency and potential for low distortion makes them suitable for use in a wide variety of electronic devices. By calculating the outputs from a classical class-D design implementing different sampling schemes we demonstrate that a more recent method, called the Fourier transform/Poisson resummation method, has many advantages over the double Four

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47

Morley, Richard James. "RF excited CO2 amplifiers for lidar." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1484.

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48

Cairns, Gerald Francis. "Development studies of XUV laser amplifiers." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295405.

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49

Zewani, Mohammed. "Low distortion wideband microwave power amplifiers." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440631.

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50

Yao, Jianguo. "Optical switching using semiconductor laser amplifiers." Thesis, University of Essex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260402.

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