Design of Broadband Doherty Power Amplifier Based on Misaligned Current Phase

Yinlong Hu, Decheng Gan and Weimin Shi ()
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Yinlong Hu: Space Star Technology Co., Ltd., Beijing 100086, China
Decheng Gan: School of Electronic Information Engineering, Yangtze Normal University, Chongqing 408102, China
Weimin Shi: School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China

Energies, 2024, vol. 17, issue 9, 1-12

Abstract: A broadband Doherty power amplifier (DPA) always experiences an efficiency degradation between two efficiency peaks, especially at two side bands. In this study, the efficiency degradation was demonstrated to be caused caused by the in-phase power combining at the saturation power level. To solve this problem, current misalignment was introduced into the broadband DPA design. The carrier and peaking PA have different current phases when performing the power combination at the saturation power level. In this work, it was also demonstrated that the efficiency in the high-power region of a DPA can be improved by elaborately using misaligned current phases. A detailed analysis and the design procedure of a broadband DPA are presented in this paper. And a 1.5–2.45 GHz broadband DPA was implemented and measured. The fabricated DPA achieves a saturation output power of 42.7–44.9 dBm, a saturation drain efficiency (DE) of 62.7–74.1% and a gain of 10.2–13.9 dB over 1.5–2.45 GHz. Moreover, the fabricated DPA also achieves a 6 dB back-off DE of more than 49.1% in the frequency band of interest.

Keywords: broadband; current phase; Doherty power amplifier; efficiency improvement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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