The equivalent input noise voltage, offset voltage drift, common mode rejection, power source rejection and other characteristics of a common source-common grid cascade amplifier is analysed in detail. 本文对一种共源-共栅串接差分输入级运算放大器的等效输入噪声电压、失调电压温漂、共模抑制比和电源电压抑制比等参数进行了详细的分析。