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成熟产品上的同相电压跟随器电路疑问

电路如上!ADC采集点为S3处。

问题一: 100pf电容和10M电阻存在这里的意义。

问题二:1M电阻和100nf 电容存在这里的意义(100nf电容之后连接到一个施密特触发器的1Y,1A连接单片机IO)