A wideband Sequential Power Amplifier

Merrick, Brian M.; King, Justin; Brazil, T.J.

doi:10.1109/mwsym.2014.6848592

Cited by 22 publications

(13 citation statements)

References 10 publications

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“…Other efficiency enhancement techniques that fall outside this classification also exist [8], among which the most renowned is the Sequential Power Amplifier (SPA) [19][20][21][22][23].…”

Section: Back-off Efficiency Enhancement Techniquesmentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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Abstract:Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.

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“…Other efficiency enhancement techniques that fall outside this classification also exist [8], among which the most renowned is the Sequential Power Amplifier (SPA) [19][20][21][22][23].…”

Section: Back-off Efficiency Enhancement Techniquesmentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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“…A high‐coupling ratio coupler is required in the SPA to maximize the power and efficiency . The Lange coupler is often used in SPA to achieve the high‐coupling ratio as in . In this article, instead of using a Lange coupler, a wideband −10 dB branch‐line coupler is used to cover two working frequency bands.…”

Section: Dual‐band Spa Designmentioning

confidence: 99%

“…A SPA using nonlinear combing coupler was presented in . In , a wide band SPA using different sized transistors with digitally‐driven input signals is introduced.…”

Section: Introductionmentioning

confidence: 99%

Design of a dual-band sequential power amplifier

Shao

Ren

Zhou

et al. 2015

Microw. Opt. Technol. Lett.

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In this article, we present a dual‐band sequential power amplifier (SPA) to provide high efficiency at power back‐offs and maximum output power at two separate working frequencies. The proposed SPA, including a carrier amplifier, a peaking amplifier, a power divider, and a combing coupler, is fabricated on Isola I‐TeraMTRF boards with 3.45 dielectric constant, 0.0028 loss tangent, and 0.508 mm substrate thickness. The SPA provides 48 and 62% drain efficiency (DE) at 6 dB output back‐ off (OBO) and maximum output power at 1.1 GHz (first design frequency), and it also provides 52 and 65% DE at 6 dB OBO and maximum output power at 1.5 GHz (second design frequency). The designed SPA achieves above 39 dBm output powers at two working frequencies with about 10 dB gain and ±1.3 dB gain flatness. To the best of the authors’ knowledge, it is the first time that a dual‐band SPA is reported and demonstrated experimentally. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:99–102, 2016

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“…A 6 dB coupler is designed in the proposed SPA to provide a balance between the output power and efficiency . The Lange coupler is often used in SPA to achieve the high coupling ratio as in . In this article, instead of using a Lange coupler, a wideband 6 dB branch‐line coupler is used to cover the design frequency band.…”

Section: Tunable Spa Designmentioning

confidence: 99%

Design of a tunable sequential power amplifier

Shao

Ren

Zhou

et al. 2015

Micro & Optical Tech Letters

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A tunable sequential power amplifier (SPA) is presented in this article. The proposed SPA, including a tunable coupler, a carrier amplifier, a peaking amplifier, and a combining coupler is fabricated on Isola I-TeraMTRF boards with 3.45 dielectric constant and 0.508 mm substrate thickness. A conventional SPA (nontunable) is also designed for reference and performance comparison. Measurement results show that the tunable SPA provides about 2 dB higher gain and 1 dB higher power output comparing with the reference design. The measurement results match well with the analysis.

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A wideband Sequential Power Amplifier

Cited by 22 publications

References 10 publications

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

Design of a dual-band sequential power amplifier

Design of a tunable sequential power amplifier

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