射频功率放大器输入阻抗测量方法的研究

Study on Input Impedance Measurement Method of RF Power Amplifier

射频功率放大器实际工作条件下的输入阻抗是匹配网络设计中一个重要参数。为了提高射频功率放大器输入阻抗的测量精度,详细分析了常用的负载拉移法影响测量精度的原因,在此基础上提出了一种新的测量方法,并给出了具体步骤。实验结果表明,该方法可对输入阻抗进行准确的测量。理论分析和实验结果均表明提出的方法是可行且准确的,它为放大器输入阻抗的精确测试提供了方便,同时也适用于在较高射频功率量级下工作的大型功率放大器件。

The input impedance of RF power amplifier under actual working state is an important parameter in the design of matching network.For increasing measurement accuracy of RF power amplifier＇s input impedance,the cause of interfering with measurement accuracy for load-pull method is analyzed,and a new method includingits specific steps is proposed.The theoretical analysis and experiment results indicate that this proposed method is feasible and accurate,and can measure input impedance of power amplifier precisely,and is applicable for devices under different power.