A High Efficiency Doherty Power Amplifier MMIC With Active Second Harmonic Injection Technique

IF 4.6 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI:10.1109/TCSII.2026.3663733

Lin Yang;Shihua Liu;Xingyuan Fu;Ming Zhang;Baozhu Wang;Qi Han;YuHang He;Weimin Hou

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引用次数: 0

Abstract

In this brief, a novel design methodology for Doherty power amplifier (DPA) MMIC is proposed to improve the efficiency of the DPAs. The design equations of a compact harmonic-controlled bias network (CHCBN) are derived, which can achieve inverse class-F amplifier load conditions with adjustable fundamental frequency impedance, this approach effectively improves the saturated and back-off efficiency of the DPA. An active second harmonic injection network (HIN) is proposed which utilizes the second harmonic components generated by the carrier and peaking devices for mutual injection to achieve the amplitude modulation of the DPA drain waveform in the saturated state, further improving the saturated efficiency of the DPA. To validate the methodology, a C-band high efficiency DPA MMIC is designed and fabricated in a

$0.25~\mu $

m GaN-HEMT process. The measurement results show that the fabricated DPA exhibits the saturated output power (Psat) of 39.6 dBm–40.6 dBm, with a saturated drain efficiency (DE) of 53.9%–61.5%, and a 6-dB back-off DE of 51.4%–56.0% over the 4.8-5.4 GHz frequency band. The proposed DPA demonstrates the highest 6-dB back-off efficiency among the published broadband GaN MMIC DPAs operating in similar frequency band.

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采用主动二次谐波注入技术的高效多赫蒂功率放大器MMIC

本文提出了一种新的Doherty功率放大器（DPA） MMIC设计方法，以提高DPA的效率。推导了一种紧凑的谐波控制偏置网络（CHCBN）的设计方程，该方法可以实现基频阻抗可调的反f类放大器负载条件，有效地提高了DPA的饱和和回退效率。提出了一种有源二次谐波注入网络（HIN），利用载波和调峰装置产生的二次谐波分量相互注入，实现了DPA漏极波形在饱和状态下的调幅，进一步提高了DPA的饱和效率。为了验证该方法，设计并制作了c波段高效DPA MMIC，工艺为0.25~\mu $ m的GaN-HEMT工艺。测量结果表明，所制备的DPA在4.8 ~ 5.4 GHz频段的饱和输出功率（Psat）为39.6 dBm ~ 40.6 dBm，饱和漏极效率（DE）为53.9% ~ 61.5%，6 db回退DE为51.4% ~ 56.0%。在已发布的工作在相似频带的宽带GaN MMIC DPA中，所提出的DPA具有最高的6db回退效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.