A 28GHz Voltage-Combined Doherty Power Amplifier with a Compact Transformer-based Output Combiner in 22nm FD-SOI

Zhiwei Zong, Xinyan Tang, Khaled Khalaf, Dongyang Yan, Giovanni Mangraviti, Johan Hoang-Dung Nguyen, Yao Liu, Piet Wambacq

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

This paper presents a Doherty power amplifier (PA) in 22nm FD-SOI for achieving high output power and high backoff efficiency for 28GHz 5G communications. The output stage of the main PA and the auxiliary PA both use a stacked-FET topology for high output power without posing a reliability issue. A dedicated transformer-based output matching network is proposed to achieve a true Doherty load modulation while maintaining a compact layout. The PA is fabricated in a 22nm FD-SOI technology with a core area of 0.2mm2. At 28GHz, the measured saturated output power (Psat), 1dB output compression point (P1dB), and peak power-added efficiency (PAE) are 22.5dBm, 21.1dBm, and 28.5%, respectively. State-of-the-art ITRS figure-of-merit (FOM) and power density are achieved. The measured 6dB power back-off (PBO) PAE is 22.1%, which results in a PBO enhancement ratio of 1.56/3.12 with respect to a class-B/class-A PA. The proposed PA can support 2.4Gb/s 64-QAM and 0.8Gb/s 256-QAM signal with a competitive average PAE.

Original languageEnglish
Title of host publication2020 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)
PublisherIEEE
Pages1-4
ISBN (Print)9781728168098, 9781728168098
DOIs
Publication statusPublished - Aug 2020
Event2020 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) -
Duration: 4 Aug 20206 Aug 2020

Conference

Conference2020 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)
Period4/08/206/08/20

Bibliographical note

Publisher Copyright:
© 2020 IEEE.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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