Wideband Quasi-Balanced Doherty Power Amplifier with Reciprocal Main/Auxiliary Setting and Mismatch-Resilient Parallel/Series Reconfiguration

This paper presents a novel reconfigurable quasi-balanced Doherty power amplifier (QB-DPA) with wide bandwidth and strong resilience to load mismatch. By leveraging the complementarity of reciprocal main/auxiliary setting and parallel/series modes, we demonstrate the first-ever broadband mismatch-re...

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Bibliographic Details
Published in2021 IEEE MTT-S International Microwave Symposium (IMS) pp. 736 - 739
Main Authors Lyu, Haifeng, Chen, Kenle
Format Conference Proceeding
LanguageEnglish
Published IEEE 07.06.2021
Subjects
balanced amplifier
Broadband amplifiers
Doherty
high efficiency
Load modulation
Microwave amplifiers
Microwave measurement
Microwave technology
Peak to average power ratio
power amplifier
Power amplifiers
Prototypes
wideband
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Summary:This paper presents a novel reconfigurable quasi-balanced Doherty power amplifier (QB-DPA) with wide bandwidth and strong resilience to load mismatch. By leveraging the complementarity of reciprocal main/auxiliary setting and parallel/series modes, we demonstrate the first-ever broadband mismatch-resilient QB-DPA. To validate the proposed theory, a broadband 1.55-2.7-GHz QB-DPA is developed using GaN technology and 3-section branch-line coupler. With matched load, the experimental results exhibit an efficiency of 57-80% at peak output power and 49-71 % at 6-dB output back-off (OBO), respectively. Modulated measurement using a 20-MHz LTE signal with 10.5-dB peak to average ratio (PAPR) shows a 44-51 % average efficiency across the operation bandwidth and up to −36 dB ACPR. More importantly, a consistent output power and improved efficiency at OP 1dB are experimentally maintained through the parallel/series modes reconfiguration at 2: 1 voltage standing wave ratio (VSWR).
ISSN:2576-7216
DOI:10.1109/IMS19712.2021.9575018