High-Efficiency Doherty Power Amplifiers

Grebennikov, Andrei; Sokal, Nathan O.; Franco, Marc J.

doi:10.1016/b978-0-12-415907-5.00010-9

Cited by 3 publications

(2 citation statements)

References 92 publications

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“…Driven by further enhancing the efficiency performance, power amplifiers have evolved from class-A to class-B and ultimately into the classical two-way Doherty amplifier topology [5][6][7][8][9] where focus has been placed on the efficiency away from output power saturation. In addition, three-way Doherty amplifiers [10][11][12][13] have also been reported as an extension of two-way Doherty amplifiers. Doherty amplifiers are typically single-input and three-way Doherty amplifiers are the most cost-effective at the moment.…”

Section: Introductionmentioning

confidence: 99%

A Study on Highly Efficient Dual-Input Power Amplifiers for Large PAPR Signals

Yamaoka

Hone

Egashira

et al. 2021

IEICE Trans. Electron.

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With the advent of 5G and external pressure to reduce greenhouse gas emissions, wireless transceivers with low power consumption are strongly desired for future cellular systems. At the same time, increased modulation order due to the evolution of cellular systems will force power amplifiers to operate at much larger output power back-off to prevent EVM degradation. This paper begins with an analysis of load modulation and asymmetrical Doherty amplifiers. Measurement results will show an apparent 60% efficiency plateau for modulated signals with a large peak-to-average power ratio (PAPR). To exceed this efficiency limitation, the second part of this paper focuses on a new amplification topology based on the amalgamation between Doherty and outphasing. Measurement results of the proposed Doherty-outphasing power amplifier (DOPA) will confirm the feasibility of the approach with a modulated efficiency greater than 70% measured at 10 dB output power back-off.

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Section: Introductionmentioning

confidence: 99%

A Study on Highly Efficient Dual-Input Power Amplifiers for Large PAPR Signals

Yamaoka

Hone

Egashira

et al. 2021

IEICE Trans. Electron.

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“…To enhance this efficiency at the average power back-off, the Doherty power amplifier (DPA) is widely used [1]- [4]. Based on the concept of load modulation, the DPA is initially proposed for the average efficiency improvement at 6-dB back-off [1].…”

mentioning

confidence: 99%

Bandwidth Enhancement of Three-Stage Doherty Power Amplifier Using Symmetric Devices

Barthwal

Rawat

Koul

2015

IEEE Trans. Microwave Theory Techn.

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This paper proposes a method for extending the bandwidth of a three-device Doherty power amplifier (DPA) based on symmetric devices. λ/4 transmission lines are inserted between each peaking amplifier output and carrier amplifier output to compensate load impedance of carrier amplifier. In order to achieve perfect load modulation, carrier amplifier output circuit total electrical length is designed to 90 degrees, and the peak amplifier output total electrical length is designed to 180 degrees. The proposed method is demonstrated by designing a three-device broadband DPA using three 10-W packaged GaN HEMT devices. Measurement results show that over 40% drain efficiency is achieved at 9-dB back-off power, over the frequency band of 1.45-2.35 GHz, accounting for 46% fractional bandwidth.

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