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Journal of Zhejiang University SCIENCE C 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/FITEE.2200250


A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier


Author(s):  Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG

Affiliation(s):  School of Microelectronics and Communication Engineering,Chongqing University, Chongqing, China; more

Corresponding email(s):   daizj_ok@126.com

Key Words:  Doherty power amplifier, Output power back-off, Output impedance, Network phase


Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG. A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier[J]. Frontiers of Information Technology & Electronic Engineering, 1998, -1(-1): .

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author="Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG",
journal="Frontiers of Information Technology & Electronic Engineering",
volume="-1",
number="-1",
pages="",
year="1998",
publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.2200250"
}

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%T A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier
%A Mingyu LI
%A Xiaobing CHENG
%A Zhijiang DAI
%A Kang ZHONG
%A Tianfu CAI
%A Chaoyi HUANG
%J Journal of Zhejiang University SCIENCE C
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%D 1998
%I Zhejiang University Press & Springer
%DOI 10.1631/FITEE.2200250

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A1 - Mingyu LI
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A1 - Tianfu CAI
A1 - Chaoyi HUANG
J0 - Journal of Zhejiang University Science C
VL - -1
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DOI - 10.1631/FITEE.2200250


Abstract: 
In this paper, a novel method is proposed for extending the output power back-off (OPBO) range of the doherty power amplifier (DPA). This study reveals that the OPBO range of the DPA can be extended by tuning the output impedance of peaking stage away from infinity and changing the phase delay of the output matching network of the carrier power amplifier. Based on this theory, a large OPBO range high efficiency asymmetrical DPA working band from 1.55 GHz to 2.2 GHz (35% relative bandwidth) is designed to verify the proposed method. Experimental results show that the DPA operates from 1.6 GHz to 2.1 GHz. The range of the measured efficiency is 42.2%-52.1% in the OPBO state and 47%-62.7% in the saturation state. The OPBO range is 11.1-13.2 dB.

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