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基于网络分析仪提高低噪声放大器的测量精度
将被消除掉，最终得到被测器件的测量结果。校准的基本类型有单端口校准，双端口校准，归一化校准还有今年刚刚推出的增强型响应校准（enhanced response calibration）。对于放大器测量，我们常常需要测量正向增益，输入端损耗，输出端损耗和反向隔离度，因此需要双端口校准。双端口误差模型如下：图1 前向误差模型图2 反向误差模型以上12项系统误差，通过双端口校准可以获得。校准后，对被测件进行测量，测量过程得到四个测量s参数s11m,s21m,s12m和s22m。基于图3所示的四个双端口误差修正公式，消除12项系统误差，最终计算出实际需要的被测件的四个s参数s11a,s21a,s12a和s22a。图3 双端口校准误差修正公式图3四个公式简化为：s11a=f(s11m,s21m,s12m,s22m，e12) s21a= f(s11m,s21m,s12m,s22m, e12)s22a=f(s11m,s21m,s12m,s22m，e12) s12a= f(s11m,s21m,s12m,s22m, e12)注：e12代表12项系统误

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