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Dissertations / Theses on the topic 'Doherty power amplifiers'

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Published: 6 September 2023
Last updated: 31 July 2025

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1

Brand, Konrad Frederik. "The experimental design and characterisation of Doherty power amplifiers." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019.1/2594.

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2

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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3

Jansen, Roelof. "Evaluation of Doherty Amplifier Implementations." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/20445.

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Thesis (MScIng)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: Modern communication systems demand efficient, linear power amplifiers. The amplifiers are often operated in the backed-off power levels at which linear amplifiers such as class B amplifier are particularly inefficient. The Doherty amplifier provides an improvement as it increases efficiency at backed of power levels. Doherty amplifiers consists of two amplifiers, a carrier amplifier and a peaking amplifier, of which the output is combined in a novel way. Implementation of the Doherty amplifier with transistors is not id
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4

Barthwal, Ayushi. "Bandwidth and dynamic range extension of load modulation in doherty pa architecture." Thesis, IIT Delhi, 2019. http://eprint.iitd.ac.in:80//handle/2074/8049.

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5

Yahyavi, Mehran. "On the design of high-efficiency RF Doherty power amplifiers." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398236.

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Power amplifiers (PAs) are one of the most crucial elements in wireless standards becasue they are the most power hungry subsystems. These elements have to face an important issue, which is the power efficiency, a fact related with the output back-off (OBO). But the OBO depends on the kind of modulated signal, in proportion to the modulated signal peak-to-average power ratio (PAPR). The higuer is the data rate, the higer is the OBO, and consequently the lower is the efficiency. A low efficiency of PAs causes the waste of energy as heat. Furthermore, the trade-off between linearity and effic
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6

Viswanathan, Vani. "Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9907.

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The power amplifiers are typically the most power-consuming block in wireless communication systems. Spectrum is expensive, and newer technologies demand transmission of maximum amount of data with minimum spectrum usage. This requires sophisticated modulation techniques, leading to wide, dynamic signals that require linear amplification. Although linear amplification is achievable, it always comes at the expense of efficiency. Most of the modern wireless applications such as WCDMA use non-constant envelope modulation techniques with a high peak to average ratio. Linearity being a critical iss
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7

Nunes, Luís Carlos Cótimos. "Nonlinear distortion generation mechanisms in Doherty amplifiers." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15944.

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Doutoramento em Engenharia Electrotécnica<br>Nowadays, wireless communications systems demand for greater mobility and higher data rates. Moreover, the need for spectral efficiency requires the use of non-constant envelope modulation schemes. Hence, power amplifier designers have to build highly efficient, broadband and linear amplifiers. In order to fulfil these strict requirements, the practical Doherty amplifier seems to be the most promising technique. However, due to its complex operation, its nonlinear distortion generation mechanisms are not yet fully understood. Currently, only heurist
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8

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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9

Markos, Asdesach Zena. "Efficiency enhancement of linear GaN RF power amplifiers using the Doherty technique." Kassel Kassel Univ. Press, 2008. http://d-nb.info/99160427X/04.

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10

Baker, Bryant. "A 3.6 GHz Doherty Power Amplifier with a 40 dBm Saturated Output Power using GaN on SiC HEMT Devices." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1781.

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This manuscript describes the design, development, and implementation of a linear high efficiency power amplifier. The symmetrical Doherty power amplifier utilizes TriQuint's 2nd Generation Gallium Nitride (GaN) on Silicon Carbide (SiC) High Electron Mobility Transistor (HEMT) devices (T1G6001032-SM) for a specified design frequency of 3.6 GHz and saturated output power of 40 dBm. Advanced Design Systems (ADS) simulation software, in conjunction with Modelithic's active and passive device models, were used during the design process and will be evaluated against the final measured results. The
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11

Bachi, Joe. "Design and implementation of high efficiency power amplifiers for 5G Applications." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT039.

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La complexité croissante des schémas de modulation due à l'évolution des normes de communication mobile a conduit à des signaux à fort rapport puissance de crête/puissance moyenne (PAPR). En conséquence, les architectures traditionnelles d'amplificateurs de puissance (PA) linéaires ne sont plus adaptées car elles présentent un faible rendement moyen lorsqu'elles fonctionnent avec de tels signaux. Une des solutions possibles à ce problème est l'utilisation d'architectures basées sur la modulation de charge qui sont capables de fournir un rendement moyen plus élevé. Ce travail se concentre sur l
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12

Acimovic, Igor. "Contributions to the Design of RF Power Amplifiers." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24406.

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In this thesis we introduce a two-way Doherty amplifier architecture with multiple feedbacks for digital predistortion based on impedance-inverting directional coupler (transcoupler). The tunable two-way Doherty amplifier with a tuned circulator-based impedance inverter is presented. Compact N-way Doherty architectures that subsume impedance inverter and offset line functionality into output matching networks are derived. Comprehensive N-way Doherty amplifier design and analysis techniques based on load-pull characterization of active devices and impedance modulation effects are developed. The
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13

Markos, Asdesach Zena [Verfasser]. "Efficiency enhancement of linear GaN RF power amplifiers using the Doherty technique / Asdesach Zena Markos." Kassel : Kassel University Press, 2009. http://d-nb.info/1006970711/34.

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14

Srirattana, Nuttapong. "High-Efficiency Linear RF Power Amplifiers Development." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6899.

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Next generation mobile communication systems require the use of linear RF power amplifier for higher data transmission rates. However, linear RF power amplifiers are inherently inefficient and usually require additional circuits or further system adjustments for better efficiency. This dissertation focuses on the development of new efficiency enhancement schemes for linear RF power amplifiers. The multistage Doherty amplifier technique is proposed to improve the performance of linear RF power amplifiers operated in a low power level. This technique advances the original Doherty amplifier sche
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15

Cui, Xian. "Efficient radio frequency power amplifiers for wireless communications." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195652135.

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16

Bathich, Khaled [Verfasser], Georg [Akademischer Betreuer] Boeck, and Renato [Akademischer Betreuer] Negra. "Analysis and Design of Efficiency-Enhancement Microwave Power Amplifiers Using the Doherty Technique / Khaled Bathich. Gutachter: Renato Negra. Betreuer: Georg Boeck." Berlin : Technische Universität Berlin, 2013. http://d-nb.info/1065664729/34.

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17

Kamarudin, Syalwani. "Advanced Doherty power amplifier design for modern communication systems." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/115269/.

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Mobile communication technologies are becoming increasingly sophisticated and have experienced rapid evolution over the last few decades, and this is especially true for the base station transmitter. In response to the ever increasing demand in communication traffic and data throughput, largely driven by video based social media platforms, both spectral and power efficient device and systems are needed to fulfil the requirements. In terms of energy consumption, the power amplifier is an important component, and although developing efficient technologies for handset equipment is important, it i
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18

Tarar, Mohsin Mumtaz. "Design and Implementation of as Asymmetric Doherty Power Amplifier at 2.65 GHz in GaN HEMT Technology." Thesis, Linköpings universitet, Elektroniska komponenter, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-75976.

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Power amplifiers are an indispensible part of the wireless communication systems. Conventional PAs provide peak efficiency at peak output power which is obtained at a certain fixed optimum resistance. These kind of amplifiers are normally called switched-mode power amplifiers (SMPAs) and are used for constant envelope signals. However, there is low efficiency at low output power which is the linear operation of a PA and is used for the amplification of non-constant envelope signals. For an optimum PA design, linearity and efficiency are the requirements. There are efficiency  enhancement techn
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19

Smith, Karla Jenny Isabella. "Gate Bias Control and Harmonic Load Modulation for a Doherty Amplifier." Thesis, University of Canterbury. Electrical and Computer Engineering, 2009. http://hdl.handle.net/10092/2856.

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Linearity and efficiency are both critical parameters for radio frequency transmitter applications. In theory, a Doherty amplifier is a linear amplifier that is significantly more efficient than comparable conventional linear amplifiers. It comprises two amplifiers, connected at their outputs by a quarter-wave transformer. The main amplifier is always on, while the peaking amplifier is off during low power levels. Load modulation of the main amplifier occurs when the peaking amplifier is on due to the quarter-wave transformer, ensuring the main amplifier never enters saturation. This resul
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20

Seneviratne, Sashieka. "Efficiency Enhancement of Pico-cell Base Station Power Amplifier MMIC in GaN HFET Technology Using the Doherty Technique." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23078.

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With the growth of smart phones, the demand for more broadband, data centric technologies are being driven higher. As mobile operators worldwide plan and deploy 4th generation (4G) networks such as LTE to support the relentless growth in mobile data demand, the need for strategically positioned pico-sized cellular base stations known as ‘pico-cells’ are gaining traction. In addition to having to design a transceiver in a much compact footprint, pico-cells must still face the technical challenges presented by the new 4G systems, such as reduced power consumptions and linear amplification of the
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21

Sajedin, M., Issa T. Elfergani, Jonathan Rodriguez, Raed A. Abd-Alhameed, M. Fernandez-Barciela, and M. Violas. "Ultra-Compact mm-Wave Monolithic IC Doherty Power Amplifier for Mobile Handsets." MDPI, 2021. http://hdl.handle.net/10454/18600.

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Yes<br>This work develops a novel dynamic load modulation Power Amplifier (PA) circuity that can provide an optimum compromise between linearity and efficiency while covering multiple cellular frequency bands. Exploiting monolithic microwave integrated circuits (MMIC) technology, a fully integrated 1W Doherty PA architecture is proposed based on 0.1 µm AlGaAs/InGaAs Depletion- Mode (D-Mode) technology provided by the WIN Semiconductors foundry. The proposed wideband DPA incorporates the harmonic tuning Class-J mode of operation, which aims to engineer the voltage waveform via second harmon
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22

Barakat, Ayman. "Doherty power amplifier efficiency and bandwidth enhancement based on a generic design approach." Thesis, Queen's University Belfast, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725336.

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This thesis presents a novel synthesis that generalizes the Doherty power amplifier theory of operation with regard to the combiner parameters. This analysis introduces, through a new parameter "x", simple formulae that re-define the relationships between the combiner parameters for a load modulation process over wide bandwidth and efficient usage at the combiner elements.
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23

Lajovic, Carneiro Marcos. "Design, optimization and integration of Doherty power amplifier for 3G/4G mobile communications." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00942844.

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The signals of the new communication standards (LTE) show a great difference between the peak and its average power (PAPR) being unsuitable for use with conventional power amplifiers because they present maximum efficiency only when working with maximum power. Doherty power amplifiers for presenting a constant efficiency for a wide power range represent a favorable solution to this problem. This work presents the design methodology and measurements results of a fully integrated Doherty Power Amplifier in 65 nm CMOS technology with constant PAE over a 7 dB backoff. Measurements from 2.4 GHz to
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24

Carneiro, Marcos Lajovic. "Design, optimization and integration of Doherty power amplifier for 3g/4g mobile communications." reponame:Repositório Institucional da UnB, 2013. http://repositorio.unb.br/handle/10482/15244.

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Tese (doutorado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Elétrica, 2013.<br>Submitted by Alaíde Gonçalves dos Santos (alaide@unb.br) on 2014-01-30T12:15:27Z No. of bitstreams: 1 2013_MarcosLajovicCarneiro.pdf: 9569833 bytes, checksum: d5a887ec15c4c2ecec643bcbe8f39b27 (MD5)<br>Approved for entry into archive by Guimaraes Jacqueline(jacqueline.guimaraes@bce.unb.br) on 2014-02-25T14:06:29Z (GMT) No. of bitstreams: 1 2013_MarcosLajovicCarneiro.pdf: 9569833 bytes, checksum: d5a887ec15c4c2ecec643bcbe8f39b27 (MD5)<br>Made available in DSpace on 2014-02-25T14:06:2
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25

Popp, Daniel [Verfasser]. "Research and Design of High Power and High Bandwidth Digital Three-Way Doherty Power Amplifier / Daniel Popp." München : Verlag Dr. Hut, 2021. http://d-nb.info/1232846651/34.

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26

Galajda, Jan. "Výkonový zesilovač v pásmu L." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316443.

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This work is focused on design of L band power amplifier. First, the design of the amplifier is substantiated by necessary theoretical basics of RF power amplifiers. Then, after comparsion of availible RF power amplifiers concepts, the doherty power amplifier is chosen as a suitable type. Design of the amplifier is focused on the linearity and efficiency. AWR design program is used for simulation of the amplifier. Amplifier is then realized and parameters are measured. Measured results are then discussed and evaluated. This work proposes design of the linear doherty amplifier for modern commun
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27

Ghazaany, Tahereh S., Raed A. Abd-Alhameed, Mark B. Child, N. T. Ali, Jonathan Rodriguez, and Abubakar S. Hussaini. "Optimum Design of Doherty RFPA for Mobile WiMAX Base Stations." Springer for the ICST, 2010. http://hdl.handle.net/10454/4484.

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Yes<br>RF power amplifiers in mobile WiMAX transceivers operate in an inherently nonlinear manner. It is possible to amplify the signal in the linear region, and avoid distortion, using output power back-off; however, this approach may suffer significant reduction in efficiency and power output. This paper investigates the use of Doherty techniques instead of back-off, to simultaneously achieve good efficiency and acceptable linearity. A 3.5 GHz Doherty RFPA has been designed and optimized using a large signal model simulation of the active device, and performance analysis under different driv
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28

Neslen, Cody R. "Negative Conductance Load Modulation RF Power Amplifier." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/312.

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The number of mobile wireless devices on the market has increased substantially over the last decade. The frequency spectrum has become crowded due to the number of devices demanding radio traffic and new modulation schemes have been developed to accommodate the number of users. These new modulation schemes have caused very poor efficiencies in power amplifiers for wireless transmission systems due to high peak-to-average power ratios (PAPR). This thesis first presents the issue with classical power amplifiers in modern modulation systems. A brief overview of current attempts to mitigate this
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29

King, Matthew E. "Linear Power-Efficient RF Amplifier with Partial Positive Feedback." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/811.

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Over the last decade, the number of mobile wireless devices on the market has increased substantially. New “multi-carrier” modulation schemes, such as OFDM, WCDMA, and WiMAX, have been developed to accommodate the increasing number of wireless subscribers and the demand for faster data rates within the limited commercial frequency spectrum. These complex modulation schemes create signals with high peak-to-average power ratios (PAPR), exhibiting rapid changes in the signal magnitude. To accommodate these high-PAPR signals, RF power amplifiers in mobile devices must operate under backed-off gain
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30

PIACIBELLO, ANNA. "Advanced High Efficiency Architectures for Next Generation Wireless Communications." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2732877.

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31

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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32

Takacs, Edward, Christopher M. Durso, and David Dirdo. "A ROBUST DIGITAL WIRELESS LINK FOR TACTICAL UAV’S." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604917.

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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>A conventionally designed radio frequency amplifier operated in its linear region exhibits low DC to RF conversion efficiency. Typically, for a power amplifier designed for digital modulation applications, the amplifier is operated “backed-off” from its P1dB point by a factor of 10 or -10 dB. The typical linear amplifier is biased for either Class A or Class A/B operation depending on the
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33

Hussaini, Abubakar S. "Energy efficient radio frequency system design for mobile WiMax applications. Modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5749.

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In today´s digital world, information and communication technology accounts for 3% and 2% of the global power consumption and CO2 emissions respectively. This alarming figure is on an upward trend, as future telecommunications systems and handsets will become even more power hungry since new services with higher bandwidth requirements emerge as part of the so called ¿future internet¿ paradigm. In addition, the mobile handset industry is tightly coupled to the consumer need for more sophisticated handsets with greater battery lifetime.
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34

Hussaini, Abubakar Sadiq. "Energy efficient radio frequency system design for mobile WiMax applications : modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5749.

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In today's digital world, information and communication technology accounts for 3% and 2% of the global power consumption and CO2 emissions respectively. This alarming figure is on an upward trend, as future telecommunications systems and handsets will become even more power hungry since new services with higher bandwidth requirements emerge as part of the so called 'future internet' paradigm. In addition, the mobile handset industry is tightly coupled to the consumer need for more sophisticated handsets with greater battery lifetime. If we cannot make any significant step to reducing the ener
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35

Zhang, Hao. "Circuit d'amplification Doherty intégré large bande pour applications radio cellulaires de puissance." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2265.

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Ces travaux de recherche concernent la conception, la réalisation et la mesure des circuits d’amplification Doherty LDMOS intégrés large-bande pour stations de base, nécessaires au développement de la 5G. Suite à la recherche des techniques pour l’amélioration du rendement électrique pour des signaux à forte dynamique d’amplitude et les possibilités d’intégration, la technique Doherty a été choisie. Des études sur les structures Doherty à deux puis trois voies montrent que l’amélioration de rendement pourra être renforcée et étendue par l’ajout d’un troisième étage avec des tailles de transist
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Courty, Alexis. "Architecture d'amplificateur de puissance linéaire et à haut rendement en technologie GaN de type Doherty numérique." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0067/document.

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Les fortes capacités actuelles et envisagées des futurs liens satellites de communication pour la 5G conduisent les signaux traités dans les charges utiles à présenter simultanément d'importantes variations d'amplitude (PAPR&gt;10dB) et de très larges bandes passantes instantanées (BW&gt;1GHz). A l'intérieur du sous-système d'émission hyperfréquence, le fonctionnement du module d'amplification de puissance se trouve très contraint par les formes d'ondes véhiculées, il se présente comme l'un des postes de consommation énergétique des plus importants, et ayant le plus d'impact sur l'intégrité du
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Ayari, Lotfi. "Contribution au développement d’un banc de mesures temporelles 4-canaux pour la caractérisation avancée de composants et de sous-systèmes RF non linéaires." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0117/document.

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Les communications futures pour les applications civiles et militaires utilisent des signaux modulés complexes large bande qui seront émis à travers des amplificateurs de puissance multivoie de type DOHERTY qui devront avoir des performances en puissance, rendement, OBO et largeur de bande qui constituent aujourd’hui un véritable défi à relever. Pour ce faire les concepteurs ont besoin d’outils de caractérisation temporelle permettant la mesure normalisées et l’optimisation des tensions et courants aux accès des dispositifs non linéaires sous pointes ou connectorisés. Ce travail de thèse a per
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Pereira, Joana Lopes Silva. "Doherty amplifier and antenna combiner." Master's thesis, 2018. http://hdl.handle.net/10773/25033.

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The conventional Doherty architecture is commonly used in wireless transmitters for its ability to boost the average efficiency of a traditional single-ended class B amplifier. It consists of two parallel single-ended amplifying branches (named carrier and peaking amplifiers) which are linked, at the output, through a /4 combiner. This output combiner commonly has a significant impact on the overall bandwidth, as it is usually built from a transmission line structure with tuned dimensions. Other non-conventional combining structures could be designed, targeting a wider bandwidth, contr
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39

Ji, Jien-Rong, and 紀建榮. "Design of High Efficiency High Power Broadband Amplifiers with Automatic Gain Control and Doherty Power Amplifier." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/63345277136376315717.

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碩士<br>國立中央大學<br>電機工程學系<br>105<br>The power amplifier is a critical building block in the RF transmitter. The efficiency、bandwidth and the ability of providing the stable output are essential issues for the power amplifiers. This thesis focuses on the efficiency and back-off power efficiency enhancement and the power amplifiers with automatic gain control loop to provide a stable output. The reactance compensation method is applied to the VHF class-E power amp lifers in chapter 2, and two 10 W and a 100 W broadband power amplifiers were implemented using Freescale laterally diffused metal oxide
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40

Wu, Yu-Ting David. "A Doherty Power Amplifier with Extended Bandwidth and Reconfigurable Back-off Level." Thesis, 2013. http://hdl.handle.net/10012/7385.

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Emerging wireless standards are designed to be spectrally efficient to address the high cost of licensing wireless spectra. Unfortunately, the resulting signals have a high peak-to-average ratio that reduces the base station power amplifier efficiency at the back-off power level. The wasted energy is converted to heat that degrades the device reliability and increases the base-station’s carbon footprint and cooling requirements. In addition, these new standards place stringent re- quirements on the amplifier output power, linearity, efficiency, and bandwidth. To improve the back-off efficiency
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41

"Novel Doherty power amplifier design for advanced communication systems." 2015. http://library.cuhk.edu.hk/record=b6116094.

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随着无线通信的蓬勃发展，新的通信标准不断出现，频谱利用率和数据传输速率提高的同时，传输信号的带宽和均峰比也不断增加。此外，多种通信标准共存的现状要求收发机能够在多个载波频率，高效率地传输不同格式的信号。因此，宽带运行和高效的放大高均峰比信号成为了基站功率放大器设计的基本要求。<br>Doherty 功率放大器结构简单，增加效率的同时能保持中等线性度，故而受到了广泛关注。本文囊括了三个有关增加Doherty 放大器工作带宽、延展高效率区或提高功率利用因子的创新设计。<br>第一个设计中，复数合路阻抗被用于扩宽Doherty 放大器的高效率区。关于动态阻抗范围，电流比因子和漏极效率的理论分析说明，复数合路阻抗可以当作新的自由度来增加放大器的高效率区。为了验证有关理论，以2GHz 为工作频点，我们使用了相同的基于GaN 工艺的晶体管，分别设计了使用复数合路阻抗和纯实数合路阻抗的Doherty 放大器。连续波测试结果显示，使用复数合路阻抗的Dohety 放大器能够提高9.1dB 的输出回退范围，比基于纯实数合路阻抗的传统设计要高3.6dB。此外，使用单载波、均峰比9.6dB 的WCDMA 信号的测试显示，基于复数合路阻抗的设计在输出功率为33.2dBm 时，其平均漏极效率高达57.4%。<br>第二个设计中使用了随频率变化的复数合路阻抗，通过控制漏极电流，来同时增加Doherty 放大器的
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Huang, Kuan Lin, and 黃冠霖. "Research of High Efficiency Doherty Power Amplifier with Adjustable Input Power Ratio of Main and Auxiliary Amplifiers." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/23158456783739496114.

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Gonçalves, Cristiano Ferreira. "Load insensitive radio frequency power amplifiers." Doctoral thesis, 2021. http://hdl.handle.net/10773/33222.

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Solid state power amplifiers (SSPAs) evolved significantly over the last few decades, mainly, due to the use of new transistor technologies, such as gallium nitride (GaN) high-electron-mobility transistors (HEMTs), very advanced computer-aided design (CAD) software, and very effective digital pre-distortion (DPD) algorithms. This led to a considerable performance improvement, in terms of energy efficiency, output power, and linearity. To achieve this performance, power amplifier (PA) designers normally push the used transistors very close to their physical safe operating limits, and con
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"High-Efficiency Doherty-Based Power Amplifiers Using GaN Technology For Wireless Infrastructure Applications." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.51658.

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abstract: The continuing advancement of modulation standards with newer generations of cellular technology, promises ever increasing data rate and bandwidth efficiency. However, these modulation schemes present high peak to average power ratio (PAPR) even after applying crest factor reduction. Being the most power-hungry component in the radio frequency (RF) transmitter, power amplifiers (PA) for infrastructure applications, need to operate efficiently at the presence of these high PAPR signals while maintaining reasonable linearity performance which could be improved by moderate digital pre-
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Lai, Yun-Jhu, and 賴畇茿. "Implementations on X/Ka-band CMOS Wideband Unilateralized Power Amplifiers and X-band GaN Power Amplifiers with Low Impedance Binary Power Combining Technique and Doherty Architecture." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e24f34.

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碩士<br>國立中央大學<br>電機工程學系<br>106<br>The thesis developed five power amplifiers that were designed in tsmcTM 0.18-µm CMOS, tsmcTM 90-nm CMOS and WINTM 0.25-µm GaN for both X-band and Ka-band operations. The best transistor size and biasing current density of the used transistors were chosen by simulating in different processes. The wideband matching was realized by the magnetically coupling transformer and the enhanced efficiency was realized by using Doherty architecture. Finally, the circuit performance was verified by the measuring small and large signal parameters, such as S-parameters, output
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Mahmoud, Mohamed Ahmed. "Adaptive Power Amplifiers for Modern Communication Systems with Diverse Operating Conditions." Thesis, 2013. http://hdl.handle.net/10012/8043.

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In this thesis, novel designs for adaptive power amplifiers, capable of maintaining excellent performance at dissimilar signal parameters, are presented. These designs result in electronically reconfigurable, single-ended and Doherty power amplifiers (DPA) that efficiently sustain functionality at different driving signal levels, highly varying time domain characteristics and wide-spread frequency bands. The foregoing three contexts represent those dictated by the diverse standards of modern communication systems. Firstly, two prototypes for a harmonically-tuned reconfigurable matching networ
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Chang, Yu-Chih, and 張瑜芝. "A 24GHz Doherty Power Amplifier." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/36270064652324302070.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>99<br>This research proposes two circuits, one is a Doherty Power Amplifier (DPA), and the other one is a transformer-coupled fully differential power amplifier, both operating at 24 GHz. Although the DPA has been extensively investigated, the effects of DPA at high frequency DPA is still relatively unexplored. Test results, suggest it is hard to achieve high power-added-efficiency (PAE) using DPA construction at higher frequencies. A single-stage 24 GHz DPA fabricated in the TSMC 130-nm CMOS process presented in this thesis, has a measured gain of 6.9 dB, delivered
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Lin, Jhen-Hong, and 林振宏. "Design of CMOS Doherty Power Amplifier." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/gmvnxx.

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碩士<br>國立中山大學<br>通訊工程研究所<br>102<br>This thesis presents a fully integrated transformer-based Doherty power amplifier in a standard 90 nm CMOS process. Doherty architecture has been proposed to enhancement the average efficiency of the transmitter, and improve efficiency under the back-off. There are two parts of this thesis, the first part is to introduce a traditional linearly power amplifier, and realize a fully integrated class A power amplifier at 2.4 GHz. The cascode structure is used in the power cells since the power amplifier is a fully differential design, a balun is utilized to conver
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Kalyan, Robin. "Reconfigurable concurrent multiband doherty power amplifier." Thesis, 2017. http://localhost:8080/iit/handle/2074/7413.

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CHEN, HAO-ZHE, and 陳浩哲. "Doherty Power Amplifier Design with Digital Predistortion." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/76e833.

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碩士<br>國立中正大學<br>電機工程研究所<br>106<br>In this study, a power amplifier is designed for efficiency and linearity by using gallium nitride high electron mobility transistors. The gain of this power amplifier is about 13 dB and the output power is 38 dBm. The architecture of this power amplifier is based on Doherty topology of which having the advantages of high linearity and efficiency. Doherty architecture uses active load modulation technology at output port and combines the characteristics with class AB and class C operations to implement high linearity and efficiency. The final result is that t
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