一个闭环电流传感器，通过一个20欧姆的采样电阻输出差分电压，输出是2.5V偏置的，但是后端的电表ADC只能接受不超过100mV的偏置电压，之前的方案是采用charge pump产生负压加一个INA来消除共模信号的，不知道目前市面上是否有集成了charge pump的同样功能的OPA？
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