3.35 GHz线性高效率Doherty功率放大器的设计

摘要

A linear high-efficiency Doherty Power Amplifier(PA) operating at 3.35 GHz is presented. The cancellation principle of the Third-order Intercept Point(IM3) in Doherty technique is adopted in order to improve the linearity of the proposed Doherty amplifier. The Doherty amplifier employs two 6 W GaN HEMT transistors namely CGH40006P from Cree to validate the proposed principle. The results shows that at the design frequency point 3.35 GHz, IM3<-30 dBc.%设计并仿真实现了一款高线性、高效率Doherty功率放大器，该功率放大器工作频率为3.35 GHz。为了提高Doherty功率放大器的线性度，本文所设计Doherty功率放大器充分利用了载波功放和峰值功放的三阶交调分量(IM3)相互抵消的原理来提高功率放大器的线性度。本文设计采用两枚Cree公司生产的6 W GaN HEMT晶体管CGH40006P进行仿真验证，仿真结果证明：在所设计频率点3.35 GHz，IM3<-30 dBc。