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差分仪表运放的输入接法请教

我的电路如上图所示,输入端由外部接入,不接时就是悬空。

1)两个1M电阻用于输入悬空时保证输出为0附近;

2)电容用作滤波退藕。

 

请问电阻电容这么混接会不会有问题,例如振荡啥的?(外部输入信号为直流。)