Broadband Virtual-Stub Doherty Power Amplifier Using Asymmetric Structure

Jaekyung Shin; Woojin Choi; Yifei Chen; Hyeongjin Jeon; Sooncheol Bae; Young Chan Choi; Hyunuk Kang; Hyungmo Koo; Young Yun Woo; Kang-Yoon Lee; Keum Cheol Hwang; Youngoo Yang

doi:10.1109/ACCESS.2023.3315608

IEEE Access (Jan 2023)

Broadband Virtual-Stub Doherty Power Amplifier Using Asymmetric Structure

Jaekyung Shin,
Woojin Choi,
Yifei Chen,
Hyeongjin Jeon,
Sooncheol Bae,
Young Chan Choi,
Hyunuk Kang,
Hyungmo Koo,
Young Yun Woo,
Kang-Yoon Lee,
Keum Cheol Hwang,
Youngoo Yang

Affiliations

Jaekyung Shin: ORCiD; 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
Yifei Chen: 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
Hyunuk Kang: Samsung Electronics Company Ltd., Suwon, South Korea
Hyungmo Koo: Samsung Electronics Company Ltd., Suwon, South Korea
Young Yun Woo: 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.2023.3315608
Journal volume & issue: Vol. 11
pp. 101425 – 101434

Abstract

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The load networks of advanced Doherty power amplifiers (DPAs) have traditionally been designed according to the ABCD parameters. In this paper, design conditions as an impedance transformation condition and an effective electrical length were used to design the output matching networks (OMNs) for the carrier and peaking amplifiers of the virtual-stub DPAs (VS-DPAs). An optimization method for the effective electrical length was proposed that was specifically constructed for the load impedances of the carrier amplifier at the low power level to have broadband characteristics through the load-pull simulation. Using the optimized design conditions for broadband design, compact OMNs for the carrier and peaking amplifiers were designed using quasi-lumped components. Moreover, an asymmetric structure with an increased power capacity of the peaking amplifier for the VS-DPA was proposed to compensate for a relatively low peak fundamental current of the peaking amplifier due to its deep class-C operation as well as the extended output back-off (OBO) range of the VS-DPA. To verify the proposed load network, a broadband asymmetric VS-DPA for the 3.3 - 4.2 GHz band was designed and implemented using GaN HEMTs with power capacities of 6 and 10 W. Using a 5G new radio (5G NR) signal with a signal bandwidth of 100 MHz and a peak-to-average power ratio (PAPR) of 7.8 dB, power gain of 8.2 - 9.1 dB, DE of 46.0 - 57.0%, ACLR of better than −45 dBc after DPD linearization at an average power of 35.0 dBm were achieved at the broad frequency range of 3.3 - 4.2 GHz.

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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