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Bandwidth enhancement of three-device Doherty power amplifier based on symmetric devices

Liu, Guohua, Cheng, Zhiqun, Zhang, Ming, Chen, Shichang, Gao, Steven (2018) Bandwidth enhancement of three-device Doherty power amplifier based on symmetric devices. IEICE Electronics Express, 15 (3). Article Number 20171222. ISSN 1349-2543. (doi:10.1587/elex.15.20171222) (KAR id:66700)

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Official URL
https://doi.org/10.1587/elex.15.20171222

Abstract

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.

Item Type: Article
DOI/Identification number: 10.1587/elex.15.20171222
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 12 Apr 2018 10:29 UTC
Last Modified: 16 Feb 2021 13:54 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/66700 (The current URI for this page, for reference purposes)
Gao, Steven: https://orcid.org/0000-0002-7402-9223
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