面向WiMAX的非对称Doherty功放研究与设计  

Research and Design of Asymmetric Doherty Power Amplifier for WiMAX

作　　者：杜学坤[1] 南敬昌[1] 李蕾[1] 李厚儒[1] 

机构地区：[1]辽宁工程技术大学电子与信息工程学院,辽宁葫芦岛125105

出　　处：《微电子学》2013年第3期350-353,358,共5页Microelectronics

基　　金：国家自然科学基金资助项目(60971048);辽宁省博士启动基金资助项目(20091033);辽宁工程技术大学科研资助项目(Y201201401)

摘　　要：针对经典Doherty结构在WiMAX应用中存在的某些缺陷,提出了一种大功率管和负载牵引技术相结合的方法,解决了经典Doherty实际输出功率小于其饱和功率的问题。设计了一款应用于3.4～3.6GHz频段WiMAX基站的非对称Doherty功率放大器,在功率回退9.5dB的范围内,功率附加效率(PAE)均在45%以上。采用添加前置延迟线和输出补偿线的方案,改善了峰值功放的负载调制效应,降低了载波功放向峰值功放的功率泄露。To deal with limitations in WiMAX application of classic Doherty structure,a method combining high power transistor with load pull technology was proposed,which solved classic Doherty＇s problem that its actual output power is less than saturated output power.An asymmetric Doherty power amplifier was designed for 3.4-3.6 GHz band WiMAX base station,which had a power added efficiency（PAE） above 45% for a 9.5 dB power back-off.Load modulation effect of the peaking power amplifier was improved and power leakage from main power amplifier to auxiliary power amplifier was reduced by using pre-positive delay line and output offset line.

关 键 词：微波存取全球互通 功率放大器 DOHERTY 前置延迟线 输出补偿线 

分 类 号：TN722.7[电子电信—电路与系统]