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Dissertations / Theses on the topic 'Multiband doherty power amplifier'

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Published: 6 September 2023

Last updated: 31 July 2025

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1

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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2

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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3

Gebremicael, Kibrom Negash. "Compressive sensing based multiband RF power amplifier linearisation." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730827.

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4

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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5

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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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

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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8

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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9

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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10

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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11

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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12

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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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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14

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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15

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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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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17

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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18

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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19

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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20

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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21

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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22

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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23

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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Kim, Ji Woo. "A GENERALIZED ARCHITECTURE FOR THE FREQUENCY-SELECTIVE DIGITAL PREDISTORTION LINEARIZATION TECHNIQUE." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339690468.

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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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26

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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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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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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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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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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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>10dB) et de très larges bandes passantes instantanées (BW>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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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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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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Kalyan, Robin. "Reconfigurable concurrent multiband doherty power amplifier." Thesis, 2017. http://localhost:8080/iit/handle/2074/7413.

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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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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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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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"Parallel Doherty RF Power Amplifier For WiMAX Applications." Master's thesis, 2018. http://hdl.handle.net/2286/R.I.51661.

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abstract: This work covers the design and implementation of a Parallel Doherty RF Power Amplifier in a GaN HEMT process for medium power macro-cell (16W) base station applications. This work improves the key parameters of a Doherty Power Amplifier including the peak and back-off efficiency, operational instantaneous bandwidth and output power by proposing a Parallel Doherty amplifier architecture. As there is a progression in the wireless communication systems from the first generation to the future 5G systems, there is ever increasing demand for higher data rates which means signals with hig

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Yang, Li-Yuan. "Doherty CMOS RF Power Amplifier for Wireless Applications." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2702200815212200.

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Hu, Jhe-Hao, and 胡哲豪. "Research on GaAs and GaN Doherty Power Amplifier." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/53s5z7.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>106<br>In wireless communication system, when the microwave signal transmits in the air, the receiver could encounter the signal distortion which causes the decoding error due to the noise interference. Therefore, if we can strengthen the transmitting signal and make better signal-to-noise ratio (SNR) of the signal, we can improve the propability of correct decoding for the reason that how to make the power amplifier deliver more output power in wireless transmitter. Besides the high output power, the demand for high efficiency of power amplifier in wireless communi

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"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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Lee, Chung-Lun, and 李忠倫. "Dual band Doherty power amplifier using CRLH transmission lines." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21699616116638583310.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>102<br>This thesis presents a new design implementation and experimental results of a dual-band E-pHEMTs Doherty power amplifier (DPA) using composite right/left-handed transmission line (CRLH-TL). The transmission line incorporating CRLH-TL is designed to replace those realized by conventional transmission lines. Compared to T-shape network or dual-band coupled line, the proposed CRLH-TL DPA has more compact circuit structure. In addition to the transmission line, the power divider and the PA unit cell also shall be in the dual-band operation. The proposed CRLH-TL

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Chen, Ying, and 陳潁. "Design of Microwave Ultra-Low-Power Low Noise Amplifier and Millimeter-wave Doherty Power Amplifier." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/93dtbj.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>107<br>This thesis consists of two parts. The first part presents a C-band ultra-low-power low noise amplifier for next-generation radio astronomical receivers. The other describes a Ka-band Doherty PA supporting the upper-frequency band of fifth-generation wireless systems. The first part of the thesis presents a C-band ultra-low-power LNA fabricated in TSMC 90-nm CMOS technology. This wideband LNA is targeted on 4-6 GHz, which is a part of IF band in ALMA bands. Due to restricted dc power consumption, a methodology of selecting a proper bias is proposed. Meanwhile

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Chen, Jian Ting, and 陳建廷. "A high efficiency Doherty Power Amplifier using GaN HEMT technology." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/nbc959.

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Hsiao, Wen-Yan, and 蕭文彥. "Design of A High-Efficiency 2.6GHz CMOS Doherty Power Amplifier." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/12286264664108792444.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>95<br>As the rapid development of mobile communications, many applications make use of wireless communication to carry their works out. The radio frequency (RF) power amplifier plays a crucial role in mobile devices for survival since it dominates about 60 to 90% of the energy consumptions in the RF transceiver. Moreover, the output power will decide the communication range and the power-added efficiency (PAE) will affect the degree of the power consumption, i.e., the surviving time of the mobile device. However, it is conflict to design a power amplifier so that it

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Tsai, Wei-Ting, and 蔡維庭. "Design of Multiband Power Amplifier and Envelope Tracking Circuit." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/6tbj6x.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>102<br>This thesis proposed an envelope tracking amplifier and a multi-band power amplifier for the multi-standard communication system such as WCDMA, LTE, 802.11g, and 802.11n. The envelope tracking amplifier is consisted of the linear-mode stage and the switch-mode stage, and that is tracking the envelope waveform and RF carrier waveform to reduce the power consumption. Hence, the power added efficiency of the power amplifier can be improved compared to the power amplifier with the fixed supply voltage. By using the capacitor switching network in the po

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"Output Bandwidth Limitations of Basestation Power Amplifier Design and Its Implementation Using Doherty Amplifier." Master's thesis, 2014. http://hdl.handle.net/2286/R.I.27400.

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abstract: This thesis is a study of Bandwidth limitation of basestation power amplifier and its Doherty application. Fundamentally, bandwidth of a power amplifier (PA) is limited by both its input and output prematch networks and its Doherty architecture, specifically the impedance inverter between the main and auxiliary amplifier. In this study, only the output prematch network and the Doherty architecture follows are being investigated. A new proposed impedance inverter in the Doherty architecture exhibits an extended bandwidth compared to traditional quarterwave line. Base on the loadline

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Abdulkhaleq, Ahmed M., Yasir Al-Yasir, Parchin Naser Ojaroudi, et al. "A 70-W Asymmetrical Doherty Power Amplifier for 5G Base Stations." 2018. http://hdl.handle.net/10454/16615.

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Yes<br>Much attention has been paid to making 5G developments more en-ergy efficient, especially in view of the need for using high data rates with more complex modulation schemes within a limited bandwidth. The concept of the Doherty power amplifier for improving amplifier efficiency is explained in addi-tion to a case study of a 70W asymmetrical Doherty power Amplifier using two GaN HEMTs transistors with peak power ratings of 45W and 25W. The rationale for this choice of power ratio is discussed. The designed circuit works in the 3.4GHz frequency band with 200 MHz bandwidth. Rogers RO4350B

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