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求分析此运放开关电路是怎样工作的?



上电后,U1的输出(UA)为高电平,U2的输出(UB)为低电平,去掉电容后,输出的电平正好是UB高电平,UA低电平,请问上电后运放的输出状态怎么分析?该开关电路怎样工作?