将模拟量与一标准值进行比较。当高于该值时，输出高(或低)电平，反之，则输出低(或高)电平。例如，将一温度信号接于运放的同相端，反相端接一电压基准-The analog comparing with a standard value.When higher than this value, the output is high (or low) level, on the other hand, the output is low (or high) level.For example, will be a temperature signal in the operational phase end, reverse termination voltage reference