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OPA2211在输入端没有信号输入时，为什么还有输出，如下图示断开C4，1脚怎么还有电压？？
亲；你说的没信号，是指输入开路还是输入短接到地？如果前者，干扰信号会通过开路端口输入而倒置输出不为0V。
输入是开路，亲，如何避免有输出呢
输入做成加法电路，注入一个直流将输出调为零。
