一款应用于Wi-Fi 6的宽带、高功率数字Doherty功率放大器

doi:10.3969/j.issn.1000-5641.2026.02.004

华东师范大学学报（自然科学版） ›› 2026, Vol. 2026 ›› Issue (2): 35-47.doi: 10.3969/j.issn.1000-5641.2026.02.004

• 射频前端与毫米波集成电路 • 上一篇下一篇

一款应用于Wi-Fi 6的宽带、高功率数字Doherty功率放大器

赵康杰, 刘灿, 张润曦*()

华东师范大学通信与电子工程学院微电子电路与系统研究所, 上海　200241

收稿日期:2025-11-04 接受日期:2026-01-06 出版日期:2026-03-25 发布日期:2026-04-03
通讯作者: 张润曦 E-mail:rxzhang@ee.ecnu.edu.cn
基金资助:
上海东方英才青年项目 (15904-412214-24013)

A high-power wideband digital Doherty power amplifier for Wi-Fi 6

Kangjie ZHAO, Can LIU, Runxi ZHANG*()

Institute of Microelectronic Circuits and Systems, School of Communication and Electronic Engineering, East China Normal University, Shanghai　200241, China

Received:2025-11-04 Accepted:2026-01-06 Online:2026-03-25 Published:2026-04-03
Contact: Runxi ZHANG E-mail:rxzhang@ee.ecnu.edu.cn

摘要/Abstract

摘要：

提出了一款面向第六代Wi-Fi (Wi-Fi 6) 应用的宽带、高功率数字Doherty功率放大器, 基于22 nm CMOS工艺实现了5.125~7.125 GHz频段覆盖. 该功率放大器采用Polar架构, 通过紧凑式全差分宽带正交输入网络, 在2 GHz带宽内实现低于6° 的相位误差, 并结合8 bit相位调制模块, 兼顾高阶调制性能与芯片集成度; 输出端将四分之一波长传输线集成至变压器模型, 构建低插损、小面积的Doherty功率合成网络, 并结合8 bit幅度调制模块实现瓦特级输出. 此外, 功率放大器通过融合Doherty负载调制与Class-G技术, 优化了6 dB和12 dB两个功率状态下的回退效率. 后仿真结果表明: 饱和输出功率为29 dBm, 峰值效率为23%, 6 dB和12 dB的回退效率分别为22%和13%; 在80 MHz带宽、256-QAM调制信号下, 误差矢量幅度 (EVM) 为 –30 dB时, 平均输出功率达21 dBm, 满足Wi-Fi 6系统对宽带、高效率及高线性度的综合需求.

关键词: 数字功率放大器, Doherty, 功率合成网络, 功率回退效率, 第六代Wi-Fi

Abstract:

In this study, we propose a class-G high-power broadband digital Doherty power amplifier (DPA) for Wi-Fi 6 applications, operating from 5.125 to 7.125 GHz. The proposed DPA is based on a polar architecture that combines Doherty load modulation with class-G amplification to achieve optimal efficiency, and it is fabricated using a 22-nm complementary metal-oxide-semiconductor (CMOS) process. At the output, a λ/4 transmission line-integrated transformer-based combining network minimizes insertion loss and enables watt-level output with an 8-bit amplitude modulation module. The results of post-layout simulations showed a saturated output power of 29 dBm, a peak power-added efficiency (PAE) of 23%, and 6- and 12-dB back-off PAEs of 22% and 13%, respectively. For an 80-MHz 256-quadrature amplitude modulation (256-QAM) signal, the DPA delivers an average output power of 21 dBm with an error vector magnitude (EVM) of –30 dB. It also achieves a phase error of less than 6° across a 2-GHz bandwidth via a compact fully differential broadband quadrature input network with an 8-bit phase modulation module. Thus, the proposed DPA meets the wideband, high-efficiency and high-linearity requirements of Wi-Fi 6 systems.

Key words: digital power amplifier, Doherty, power combiner, power back-off (PBO) efficiency, Wi-Fi 6

中图分类号:

TN432

赵康杰, 刘灿, 张润曦. 一款应用于Wi-Fi 6的宽带、高功率数字Doherty功率放大器[J]. 华东师范大学学报（自然科学版）, 2026, 2026(2): 35-47.

Kangjie ZHAO, Can LIU, Runxi ZHANG. A high-power wideband digital Doherty power amplifier for Wi-Fi 6[J]. J* E* C* N* U* N* S*, 2026, 2026(2): 35-47.

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Reference	Process/ nm	Architecture	Freq./GHz	PSat/ dBm	Peak SE/%	PBO SE	P_avg/dBm	Modulation	EVM/dB	VDD/V
This work	22	Digital IQ Doherty	5.125~7.125	29	23	22% @6dB/ 13% @12dB	21 @256-QAM/ 21.8 @64-QAM	64-QAM/ 256-QAM	–30	0.9/3.3
JSSC 2020^[3]	28	Digital Polar	5~6	27	–	26% @6dB	21 @1024-QAM	1024-QAM	–35	1.4
ISSCC 2020^[4]	55	Analog	2.4/5~6	28.5/29	–	–	20	1024-QAM	–35	3.3
ISSCC 2022^[5]	40	Digital IQ	5~7.125	28	28.5	15% @6dB	17.8 @5G 1024-QAM	1024-QAM	–35	1.2
ISSCC 2024^[11]	28	Digital IQ	0.8~2.4	28.3	41	–	24.2 @64-QAM 22.5 @64-QAM	64-QAM	–28	1.1/2.2

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一款应用于Wi-Fi 6的宽带、高功率数字Doherty功率放大器

A high-power wideband digital Doherty power amplifier for Wi-Fi 6

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