New Compact Load Network for Doherty Power Amplifiers Based on L-Section Matching Network of the Carrier Amplifier and Post-Matching Network

Yifei Chen; Woojin Choi; Jaekyung Shin; Hyeongjin Jeon; Sooncheol Bae; Soohyun Bin; Sunwoo Nam; Young Chan Choi; Hyunuk Kang; Kang-Yoon Lee; Keum Cheol Hwang; Youngoo Yang

doi:10.1109/ACCESS.2023.3291219

IEEE Access (Jan 2023)

New Compact Load Network for Doherty Power Amplifiers Based on L-Section Matching Network of the Carrier Amplifier and Post-Matching Network

Yifei Chen,
Woojin Choi,
Jaekyung Shin,
Hyeongjin Jeon,
Sooncheol Bae,
Soohyun Bin,
Sunwoo Nam,
Young Chan Choi,
Hyunuk Kang,
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
Soohyun Bin: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
Sunwoo Nam: 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
Hyunuk Kang: ORCiD; Samsung Electronics Company Ltd., 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.2023.3291219
Journal volume & issue: Vol. 11
pp. 66478 – 66487

Abstract

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This paper presents a new compact load network for Doherty power amplifiers (DPAs) with only two matching networks, such as an output matching network of the carrier amplifier, and the post-matching network (PMN), even in the presence of parasitic circuits of the packaged transistor. The load network of the carrier amplifier can be configured using a simple L-section matching structure for the complex load impedance. No matching network is required between the peaking amplifier and the current combining junction. As a result, the proposed load network can have a very compact structure with only a short transmission line, and a shunt element for the carrier amplifier, in addition to the PMN. To verify the proposed circuit, a DPA based on two packaged GaN-HEMTs was designed and implemented to have a peak output power of more than 43 dBm for the 3.5-4.0 GHz band. By the measurement results using a 5G NR signal with a peak-to-average power ratio (PAPR) of 7.9 dB and a signal bandwidth of 100 MHz, a power gain of more than 10.5 dB, and a drain efficiency (DE) of 49.5-55.4% at an average power of 36.5 dBm in the frequency band was exhibited. After applying digital pre-distortion (DPD), an adjacent channel leakage power ratio (ACLR) of -51.0 dBc was achieved.

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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