E-PHEMT射频功率放大器的设计与仿真

摘要

针对实现功率放大器输出端获得最大输出功率,放大器设计主要保证能减小失真,增加线性度,就可以提高功率,为此提出了一种利用负载牵引法找出功率放大器的最大输出功率时的最佳外部负载阻抗ZL的方法.并通过实例对中心频率为3GHz,带宽为1GH:射频放大器的稳定性,输入输出负载阻抗圆,以及功率增益进行了仿真,并给出了仿真结果和最终设计电路.仿真结果表明,功率放大器设计完全满足设计指标.并对功率放大器设计提供了重要的参考依据.%In this paper, a design of load -pull is proposed to design the amplifier.The method is to find an optimal load impedance to achieve the maximum of output power of amplifer.The process of design for amplifier with a center frequency of 3GHz and bandwidth of 1GHz is presented, and the stability input, output load -pull and power gain are simulated.Then simulation results are given.The results show that this design can meet the performance require of the specified amplifier.This method has an important practical value for RF amplifier design.