Design of a Fully Integrated Wideband Continuous-Mode Asymmetrical Doherty Power Amplifier in GaN-on-SiC HEMT Technology

DOI number:10.1109/TCSII.2024.3434572

Affiliation of Author(s):国立新加坡大学，中国科学技术大学，香港城市大学

Teaching and Research Group:Dept. ECE, Dept. EEIS, Dept. EE

Journal:IEEE Transactions on Circuits and Systems-II: Express Briefs

Key Words:Broadband, Doherty power amplifier (DPA), monolithic microwave integrated circuit (MMIC)

Abstract:In this brief, a novel continuous-mode asymmetrical Doherty power amplifier (CM-ADPA) is proposed. It is illustrated that by applying complex impedance at the power combining node, the continuous-mode impedance condition can be obtained for the main amplifier at both saturation and output power back-off (OBO) to obtain broadband high-efficiency performance. To further expand the bandwidth, an LC-ladder-based lumped Wilkinson divider and impedance inverter are employed for wideband power division and phase alignment between sub-amplifiers, respectively. To validate the proposed topology, a CM-ADPA monolithic microwave integrated circuit (MMIC) is implemented with a highly compact die size of 2.2 × 1.8 mm2 . The fabricated MMIC obtains a 4.4-5.6 GHz bandwidth. Within the operating band, the DPA exhibits a saturation output power of 40.7-41.0 dBm, a saturated drain efficiency (DE) of 53.7%- 59.4%, and a DE of 34.0%-43.8% at 8-dB OBO. Under a 100 MHz orthogonal frequency division multiplexing (OFDM) signal, the CM-ADPA also demonstrates good linearity and efficiency.

Co-author:Renlong Han,Falin Liu

First Author:Jingyuan Zhang

Indexed by:Journal paper

Correspondence Author:Xu Yan,Yongxin Guo

Document Code:10.1109/TCSII.2024.3434572

Discipline:Engineering

Document Type:J

Volume:71

Issue:12

Page Number:4879-4883

Translation or Not:no

Date of Publication:2024-12-02

Included Journals:SCI、EI