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[放大器-信号链] 用TLC27L4IN做电压跟随电路输出电压和输入电压不等?



网友  chenna400 在 21ic TI 模拟技术 论坛问以下问题:

输入信号为毫伏级电压,经过一个100M电阻和510pf构成的低通滤波之后接到运放构成的电压跟随器中,电压跟随我直接将反相输入端接到输出端,然后将输出端接到STM32的AD口,没接AD的时候测试正常,接了之后,发现运放输出电压与负电源相等,为-5v,不知道为什么?求高手指点