New Load Modulation Combiner Having a Capability of Back-Off Control for Doherty Power Amplifiers

Yifei Chen; Woojin Choi; Jaekyung Shin; Hyeongjin Jeon; Sooncheol Bae; Young Chan Choi; Cheon-Seok Park; Kang-Yoon Lee; Keum Cheol Hwang; Youngoo Yang

doi:10.1109/ACCESS.2023.3240649

IEEE Access (Jan 2023)

New Load Modulation Combiner Having a Capability of Back-Off Control for Doherty Power Amplifiers

Yifei Chen,
Woojin Choi,
Jaekyung Shin,
Hyeongjin Jeon,
Sooncheol Bae,
Young Chan Choi,
Cheon-Seok Park,
Kang-Yoon Lee,
Keum Cheol Hwang,
Youngoo Yang

Affiliations

Yifei Chen: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Woojin Choi: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Jaekyung Shin: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Hyeongjin Jeon: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Sooncheol Bae: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Young Chan Choi: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Cheon-Seok Park: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Kang-Yoon Lee: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Keum Cheol Hwang: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Youngoo Yang: ORCiD; Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea

DOI: https://doi.org/10.1109/ACCESS.2023.3240649
Journal volume & issue: Vol. 11
pp. 11479 – 11488

Abstract

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A new load modulation combiner (LMC) having the capability of back-off control is proposed for a Doherty power amplifier (DPA). The proposed LMC consists of two transmission lines tied at the combining node, and a shunt element across the other ends of the transmission lines. The shunt element of the LMC becomes virtually open-circuited at the peak power level and allows the carrier amplifier to have an arbitrary load impedance at the low power level. The operating principle and circuit structure of the DPA based on the proposed LMC are presented in detail. The proposed DPA was implemented using GaN-HEMT for the 3.5 - 4.0 GHz band. Using a 5G NR signal with a peak-to-average power ratio (PAPR) of 7.9 dB and signal bandwidth of 100 MHz, the implemented DPA showed drain efficiency (DE) of 49.6 - 54.4% and power gain of 11.1 - 13.0 dB at an average output power of 34.5 dBm. An adjacent channel leakage power ratio (ACLR) was obtained as −50.4 - −45.0 dBc at the average power level with a digital pre-distortion (DPD) technique.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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