Power amplifiers and transmitters for RF and microwave

Raab, Frederick H.; Asbeck, P.M.; Cripps, Steve C.; Kenington, P.B.; Popović, Zoya; Pothecary, Nick; Sevic, John F.; Sokal, Nathan O.

doi:10.1109/22.989965

Cited by 964 publications

(457 citation statements)

References 25 publications

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“…Envelope elimination and restoration (EER) [1], envelope tracking (ET) [2] and dynamic load modulation (DLM) [3] are some of the most promising examples. The basic principle of these PA architectures is to keep the operating point of the PA close to saturation by manipulating the power supply (ET and EER) or load impedance (DLM), for a wide range of power levels.…”

Section: Introductionmentioning

confidence: 99%

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Cao

Fager

Khan

et al. 2011

2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits

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Abstract-This paper compares bandwidth reduction schemes for baseband control signals used in high efficiency power amplifier (PA) architectures, such as envelope tracking and dynamic load modulation (DLM). The baseband control signal used in such architectures usually has 3-4 times wider bandwidth than the modulated radio frequency (RF) signal. Such a wideband signal brings challenges for practical hardware design. In this paper, two bandwidth reduction schemes originally used in envelope tracking are applied on a DLM PA. The performance of both schemes are investigated by simulation. The results show that the bandwidth of the baseband control signal can be effectively reduced from 12.5 MHz to 4 MHz, while at the same time, maintaining a 49% average power-added and acceptable linearity.

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Section: Introductionmentioning

confidence: 99%

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Cao

Fager

Khan

et al. 2011

2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits

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“…A broadband power amplifier which can cover different frequency bands is required to cut down hardware cost and make a communication system smaller. For some applications such as communication base stations and radar applications [1], the requirements of output power and efficiency are also very critical. GaN device is very suitable for these applications because of its high breakdown field, high electron saturation velocity, as well as high carrier density and mobility.…”

Section: Introductionmentioning

confidence: 99%

A 2-4 GHZ Octave Bandwidth Gan Hemt Power Amplifier With High Efficiency

Guo¹,

Chen²,

Hao-quan³

et al. 2016

PIER Letters

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Abstract-In this paper, a broadband power amplifier with high efficiency and output power based on GaN HEMT is presented. The design of broadband matching network and transistor package modeling is presented, and a simulation strategy is proposed to increase the simulation accuracy. According to measured results, the PA module shows a linear gain of 10∼13 dB during 1.9-4 GHz. The efficiency can reach 74.5%, and the maximum output power reaches 33.2 Watt. For a 5-MHz WCDMA signal, the designed power amplifier achieves an average output power above 20 W when ACLR = −30 dBc over the entire working band.

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“…Recently, research works have been conducted on extending the bandwidth capability of the Doherty amplifier [1][2][3][4]. However, a number of bandwidth limiting factors makes it difficult to maintain wideband performance in the Doherty amplifier.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of 80-W wideband asymmetrical Doherty amplifier

Bathich

Boeck

2014

Int. j. microw. wirel. technol.

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Design and analysis of 80-W wideband asymmetrical Doherty amplifier khaled bathich and georg boeckThis paper presents the analysis and design of a wideband asymmetrical Doherty amplifier. The frequency response of the output combining network of the Doherty amplifier with arbitrary back-off level configuration is analyzed. Other bandwidthlimiting factors were discussed and analyzed as well. A number of performance enhancement techniques were taken into consideration to obtain high and flat back-off efficiency over the amplifier design band of 1.7-2.25 GHz. The designed Doherty amplifier had, at 8.0-9.9 dB output back-off, a minimum efficiency of h ¼ 50% [power-added efficiency of 45%], measured near 40 dBm of output power, and over 28% bandwidth. Using digital predistortion (DPD) linearization, an adjacentchannel leakage ratio (ACLR) of 243 dBc was obtained for a single-carrier W-CDMA signal, at 40.9 dBm and 46% of average output power and drain efficiency, respectively. The designed amplifier represents the first wideband Doherty amplifier reported over extended power back-off range.

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Power amplifiers and transmitters for RF and microwave

Cited by 964 publications

References 25 publications

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

A 2-4 GHZ Octave Bandwidth Gan Hemt Power Amplifier With High Efficiency

Design and analysis of 80-W wideband asymmetrical Doherty amplifier

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