一种Doherty功率放大器的频带拓展方法设计与实现

doi:10.3969/j.issn.1671-7775.2023.06.008

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摘要 5G及后续的通信系统相比于4G通信系统需要使用更宽的带宽，为了突破传统Doherty功率放大器的窄带限制，提出一种拓宽带宽的方法.该方法利用双阻抗匹配对主功放输出匹配电路进行合理的设计并用后匹配结构优化功率合成网络，形成Doherty功率放大器简单的宽带化电路结构.为验证提出的方法，用GaN晶体管CGH40010设计了带宽为3.3~3.7 GHz的Doherty功率放大器并进行测试.实际测试结果显示，该Doherty功率放大器实现了3.3~3.7 GHz工作带宽，获得了43.2~44.5 dBm的饱和输出功率，在饱和状态下和6 dB功率回退状态下的效率分别为67%~76%和42%~56%,饱和增益为8~11 dB.

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	熊得安1
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	曹立锋1
	2
	程润生1
	2

关键词 ： Doherty功率放大器, 双阻抗匹配, 后匹配, 宽带, 回退效率

Abstract：5G and beyond communication systems need wider bandwidth compared to 4G communication system. To break through the narrow band limitation of conventional Doherty power amplifier, a method was proposed to broaden the bandwidth. Two impedance matching was used to design output matching circuit of main power amplifier properly， and the post-matching structure was used to optimize the power synthesis network. A simple and wideband circuit structure of Doherty power amplifier was formed. To verify the proposed method, the 3.3-3.7 GHz Doherty power amplifier with GaN transistors CGH40010 was designed and measured. The measurement results show that the designed Doherty power amplifier has bandwidth ranging from 3.3 to 3.7 GHz with saturated power of 43.2-44.5 dBm and saturated gain of 8-11 dB. The drain efficiencies at saturation and 6 dB output power back-off level are 67%-76% and 42%-56%， respectively.

Key words： Doherty power amplifier two impedance matching post-matching broadband back-off efficiency

收稿日期: 2022-01-23

基金资助:国家自然科学基金资助项目(11973034); 电波环境特性及模块化技术重点实验室基金资助项目(614240301011801)

作者简介: 熊得安(1996—)，男，河南南阳人，硕士研究生(199603175818@whut.edu.cn),主要从事射频微波技术的研究. 刘成国(1966—)，男，河南新乡人，教授(通信作者，liucg@whut.edu.cn)，主要从事电波传播与天线、电磁场与微波技术的研究.

引用本文:

熊得安1,2，刘成国1,2，黄立峰2,3,4，曹立锋1,2，程润生1,2. 一种Doherty功率放大器的频带拓展方法设计与实现 [J]. 江苏大学学报（自然科学版）, 2023, 44(6): 672-679. XIONG Dean1,2， LIU Chengguo1,2， HUANG Lifeng2,3,4， CAO Lifeng1,2， CHENG Runsheng1,2. Design and implementation of a band expansion method for Doherty power amplifier [J]. Journal of Jiangsu University(Natural Science Eidtion) , 2023, 44(6): 672-679.

链接本文:

http://zzs.ujs.edu.cn/xbzkb/CN/10.3969/j.issn.1671-7775.2023.06.008 或 http://zzs.ujs.edu.cn/xbzkb/CN/Y2023/V44/I6/672

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