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On-line Access: 2024-08-27

Received: 2023-10-17

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Frontiers of Information Technology & Electronic Engineering 

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Design of wideband symmetrical large back-off range Doherty power amplifier based on impedance and phase hybrid optimization


Author(s):  Zhongpeng NI, Jing XIA, Xin Yu ZHOU, Wa KONG, Wence ZHANG, Xiao-Wei ZHU

Affiliation(s):  School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang 212013, China; more

Corresponding email(s):  jingxia@ujs.edu.cn

Key Words:  Back-off power range; Doherty power amplifier; Fragment-type structure; Impedance-phase hybrid function


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Zhongpeng NI, Jing XIA, Xin Yu ZHOU, Wa KONG, Wence ZHANG, Xiao-Wei ZHU. Design of wideband symmetrical large back-off range Doherty power amplifier based on impedance and phase hybrid optimization[J]. Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/FITEE.2400066

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author="Zhongpeng NI, Jing XIA, Xin Yu ZHOU, Wa KONG, Wence ZHANG, Xiao-Wei ZHU",
journal="Frontiers of Information Technology & Electronic Engineering",
year="in press",
publisher="Zhejiang University Press & Springer",
doi="https://doi.org/10.1631/FITEE.2400066"
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%T Design of wideband symmetrical large back-off range Doherty power amplifier based on impedance and phase hybrid optimization
%A Zhongpeng NI
%A Jing XIA
%A Xin Yu ZHOU
%A Wa KONG
%A Wence ZHANG
%A Xiao-Wei ZHU
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doi="https://doi.org/10.1631/FITEE.2400066"

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A1 - Wence ZHANG
A1 - Xiao-Wei ZHU
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Abstract: 
The present paper proposes an optimization design method for the Doherty output matching network (OMN) using impedance-phase hybrid objective function constraints, which possess the capability of enhancing the efficiency consistency of the Doherty power amplifier (DPA) using integrated enhancing reactance (IER) during the power back-off range. By calculating the desired reactance for an extended power back-off range and combining it with the two-impedance matching method, the S-parameters of the OMN are obtained. Meanwhile, the impedance and phase constraints of the OMN are proposed to reduce the distribution range of the IER. Furthermore, a fragmenttype structure was employed in the OMN optimization so as to enhance the flexibility of the circuit optimization design. To validate the proposed method, a 1.7–2.5 GHz symmetrical DPA with a large back-off power (BOP) range was designed and fabricated. Measurement results demonstrate that across the entire operating frequency band, the saturated output power >44 dBm, and the efficiency ranges from 45% to 55% at a 9 dB BOP.

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