不止一款芯片出现过该情况,比如8脚的opa228做个简单的跟随器,没有信号给入同向输入端时,竟也能在同向输入端检测到有直流电平近2V存在。后来,尝试仅给芯片供电,其他引脚不做任何处理和连接,仍有直流电平存在,求解释!!!
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同向输入端加一定电阻到地呢?
这类放大器输入阻抗太高(几十兆欧到上千兆欧姆),如果输入什么都没接,外界噪声或者运放本身偏置失调都会导致有输出。