微波放大器输出端热态网络参数测量方法研究

Study on the method of microwave amplifier hot network parameters measurement at output port

针对微波放大器热状态下网络参数的测试难题,分析了传统负载牵引法和矢量网络分析仪冷态测试法的优缺点,提出了一种基于双源矢量网络分析仪的放大器输出端热态网络参数测量方法。通过控制矢量网络分析仪内部双源频偏,使放大器工作频率和测试频率保持微小偏移并同步扫描,在常规双端口条件下校准即可实现放大器功率输出端的热态网络参数的直接测量。给出了热态网络参数测试的注意事项,且该方法已经应用在了国产矢量网络分析仪产品功能选项上。

To solve the difficult problem of microwave amplifier hot network parameters measurement, advantages and disadvantages of the traditional load-pull method and the cold measuring method by VNA are analyzed, and a method of microwave amplifier hot network parameters measurement at output port based on dual-source VNA is given. By setting the two source of a VNA to keeping the tiny offset of working frequency and testing frequency, the hot network parameters at output port can be measured directly with a traditional dual port calibration. Matters needing attention are given, and the method has been applied to the domestic VNA products.