基于谐波控制的线性高效Doherty功率放大器  

Linear high-efficiency Doherty power amplifiers based on harmonic tuning approaches

作　　者：甘德成[1,2] 何松柏[2] GAN Decheng;HE Songbai(School of Physics and Electronic Engineering,Yibin University,Yibin Sichuan 644000,China;School of Electronic Engineering,UESTC,Chengdu Sichuan 611731,China)

机构地区：[1]宜宾学院物理与电子工程学院,四川宜宾644000 [2]电子科技大学电子工程学院,四川成都611731

出　　处：《太赫兹科学与电子信息学报》2018年第5期860-863,共4页Journal of Terahertz Science and Electronic Information Technology

基　　金：宜宾市科局资助项目(2013GY019);国家自然科学基金资助项目(6271036)

摘　　要：设计并实现了一款工作在3.5GHz全球微波接入互操作性(WiMAX)波段的高效率、线性Doherty功率放大器。通过合理控制载波功放的包络阻抗、谐波阻抗以及利用Doherty载波功放和峰值功放线性抵消原理,使得Doherty功率放大器同时满足高的效率和线性度。仿真结果表明:通过合理调节峰值功放的栅极偏压,所设计的Doherty功放在保证三阶交调失真(IMD3)和五阶交调失真(IMD5)低于-30 dBc时,功率附加效率(PAE)可高达63%。A highly efficient and linear Doherty Power Amplifier(PA)which operates at 3.5 GHz World Interoperability for Microwave Access(WiMAX)band is designed.To maintain high linearity and high efficiency of the Doherty PA,a technique adjusting the baseband and harmonic impedances appropriately is applied to the carrier cell,and nonlinearity cancellation between the carrier PA and the peaking one is also utilized.The simulation results show that using the appropriate gate bias of the peaking amplifier,the proposed Doherty power amplifier can achieve the Power-Added Efficiency(PAE)as high as 63%,while the third-order Inter-Modulation Distortion(IMD3)and the fifth-order Inter-Modulation Distortion(IMD5)are less than-30 dBc.

关 键 词：DOHERTY功率放大器 谐波控制 交调失真 

分 类 号：TN837[电子电信—信息与通信工程]