High-efficiency three-way Doherty power amplifier using reconfigurable PD

Shiwei Zhao; Jun Guan; Xiaoqi Zhou; Yuehang Xu

doi:10.1515/freq-2020-0165

Article

High-efficiency three-way Doherty power amplifier using reconfigurable PD

Shiwei Zhao , Jun Guan , Xiaoqi Zhou and Yuehang Xu

Published/Copyright: May 20, 2021

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From the journal Frequenz Volume 75 Issue 7-8

Abstract

In this paper, a new reconfigurable power divider (PD) is proposed to improve the efficiency of the three-way Doherty power amplifier (DPA). The conventional λ/4 transmission line is replaced by the proposed reconfigurable PD in the input of peaking amplifier, where the 90° phase shift and impedance matching can be achieved. Furthermore, the output power distribution ratio (PDR) can be continuously adjusted in a large range by adjusting the reverse voltage of the varactor diodes. Therefore, the reconfigurable PD with the best PDR can assign input power to the peaking amplifier. Experiment results show that the maximum measured power added efficiency (PAE) of the proposed three-way DPA is 49%, which is improved by 5% compared with conventional three-way DPA.

Keywords: high efficiency; power added efficiency; reconfigurable PD; three-way Doherty power amplifier

Corresponding author: Shiwei Zhao, Chongqing University of Posts and Telecommunications, Chongqing, China; and University of Electronic Science and Technology of China, Chengdu, China, E-mail: zhaosw@cqupt.edu.cn

Funding source: the Natural Science Foundation of Chongqing under Grant

Award Identifier / Grant number: cstc2018jcyjAX0014

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was supported in part by the Natural Science Foundation of Chongqing under grant cstc2018jcyjAX0014.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-09-27

Accepted: 2021-04-27

Published Online: 2021-05-20

Published in Print: 2021-07-27

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Articles in the same Issue

https://doi.org/10.1515/freq-2020-0165

Keywords for this article

high efficiency; power added efficiency; reconfigurable PD; three-way Doherty power amplifier