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我想用amc1300来放大电压，数据手册上说增益是8.2，按理输出应该是输入差分电压的8.2倍。但是我按如图电路原理图测试了以下，当输入0-40V时，原边输入正负管脚电压差大概0-18mV左右，但是输出正负管脚一直维持-18.5mV，请问这是什么原因呢？
