一种Doherty功率放大器的频带拓展方法设计与实现  

Design and implementation of a band expansion method for Doherty power amplifier

作　　者：熊得安 刘成国[1,2] 黄立峰 曹立锋 程润生 XIONG Dean;LIU Chengguo;HUANG Lifeng;CAO Lifeng;CHENG Runsheng(School of Science,Wuhan University of Technology,Wuhan,Hubei 430070,China;Hubei Engineering Research Center of RF-Microwave Technology and Application,Wuhan,Hubei 430070,China;School of Information Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;China Research Institute of Radiowave Propagation,Qingdao,Shandong 266107,China)

机构地区：[1]武汉理工大学理学院,湖北武汉430070 [2]湖北省射频微波技术应用工程技术研究中心,湖北武汉430070 [3]武汉理工大学信息工程学院,湖北武汉430070 [4]中国电波传播研究所,山东青岛266107

出　　处：《江苏大学学报（自然科学版）》2023年第6期672-679,共8页Journal of Jiangsu University：Natural Science Edition

基　　金：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)。

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.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.

关 键 词：DOHERTY功率放大器 双阻抗匹配 后匹配 宽带 回退效率 

分 类 号：TN722.5[电子电信—电路与系统]