A_Doherty功率放大器的仿真设计.pdf

34 5 ELECT RON IC M EASU REMEN T TECHN OL OGY 2011 5 ADoherty 杜金才 姚 伟 余家家 ( 上海交通大学信息安全工程学院 上海 200233) : 3G , , , , A B , Dohert , A DS , , ( ) , ADohert , 1 1. 9 GHz, 15 dB, P3 dB 57 dBm49 dBm , PAE 50% : ADohert ; A DS; ; P3 dB; PAE : T N722 : A Design of ADoherty power amplifier with ADS Du Jincai Yao Wei Yu Jiajia ( School of Information Securit E ngineering of Shanghai Jiao tong Universit , Shanghai 200233) Abstract: A s the 3G technolog development, t he transmission rate rise, new modulat ion mode application, the signal Peakt oAverage Ratio are better than before, and the linearit demand of base st ation is higher and higher. The pow er am plifier w ith the traditional A B class or the feedforw ard can meet linearit demand, but hard to meet the requirements of s stems pow er consumption. In t his paper, based on the theor of Dohert , A DS as design tools, an optimal bilateral pull method was used to increase efficienc of the single pow er amplif ier. Optimal offset lines were to get the best pow er combined for ADohert design. According to the simulation, the result show s that the gain of this amplifier is 15 dB, t he P3 dB is 57 dBm at least , and the PAE is higher than 50% w hen the output power is 49 dBm. Keywords: ADohert ; A DS; gain; P3 dB; PAE efficienc 0 1 , 1. 1 Doherty , Dohert W. H . [3] , Dohert 1936 , , , 1 D