差分 输入电压范围：70uV到70mV
输入电阻：约40欧姆
输入频率：50Hz，保留5次谐波
精度要求要求最低分辨率在70uV。
供电电压正负3.3V；处理后信号需要电压抬升到1.024V，AD基准电压2.048V；
其中认为需要用到积分器、低通滤波器、电压抬升、电压跟随器。非常期待
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