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您好,输入部分Vin+-部分看不到电路了,输入是什么幅值范围的PWM信号,参考是什么电平? 因为Vout是上拉到5V的信号,所以比较器的输出高电平应该为5V,低电平为参考电平。 看是否超过了这个范围导致测量不出信号,我用TINA简单的仿真了下LM111, 和LM211 电气参数差不多,1Mhz方波是没问题的。