你好,请问使用lm2904设计电压跟随电路,在设计PCB板时没有注意到,使得供电电压的地与运放输出信号的地,在大电流流过地线的时候存在几十mv的电势差,不知道这是怎么回事?当我把lm2904换为同封装形式的OPA2172又不存在这样的情况了
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