基于滤波结构的宽带Doherty功率放大器的设计  

Design of Broadband Doherty Power Amplifier Based on Filtering Structure

作　　者：王坤 程知群[1,2] 贾民仕 朱浙鸣 钟保全 李冰鑫 杨正好 WANG Kun;CHENG Zhiqun;JIA Minshi;ZHU Zheming;ZHONG Baoquan;LI Bingxin;YANG Zhenghao(Key Lab of RF Circuit and System,Ministry of Education,Hangzhou Dianzi University,Hangzhou 310018,China;College of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]杭州电子科技大学射频电路与系统教育部重点实验室,杭州310018 [2]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《微波学报》2025年第1期16-20,97,共6页Journal of Microwaves

基　　金：浙江省科技计划项目(2024C01076);科技部基地平台(D20011);陕西省重点研发计划(2023-ZDLGY-49);杭州电子科技大学项目(KYS045624199)。

摘　　要：本文提出了一种具有高效集成滤波特性的宽带高效率Doherty功率放大器的设计。载波功率放大器采用扩展连续F类设计,耦合微带线滤波器结构用于后匹配设计。这种滤波结构的终端由级联在一起的微带线组成,以增强带外抑制效果。这种结构不仅提高了效率,而且拓宽了带宽。使用10 W氮化镓高电子迁移率晶体管器件设计和实现了Doherty功率放大器,验证了其宽带特性。在1.6 GHz~2.4 GHz频段内,实现了7.7 dB~9.9 dB的饱和增益和43.1 dBm~44.7 dBm的饱和功率,在功率回退6 dB和饱和功率时的漏极效率分别为50.1%~58.8%和59.9%~73.3%。A design of a broadband high-efficiency Doherty power amplifier with efficient integrated filtering characteristics is proposed.The carrier power amplifier is designed using extended continuous class F,and a coupled microstrip line filter structure is used for post matching design.The terminal of this structure is composed of microstrip lines cascaded together to enhance the out of band suppression effect.This structure not only improves efficiency but also widens the frequency band.Doherty power amplifier is designed and implemented using 10 W gallium nitride high electron mobility transistors devices,and its broadband characteristics are verified.In 1.6 GHz~2.4 GHz,the Doherty power amplifier achieves a saturation gain of 7.7 dB~9.9 dB and a saturation power of 43.1 dBm~44.7 dBm,the drain efficiency at 6 dB output backoff and saturation is 50.1%~58.8%and 59.9%~73.3%.

关 键 词：宽带 扩展连续F类 DOHERTY功率放大器 带通滤波 后匹配网络 

分 类 号：TN722.75[电子电信—电路与系统] TN92