Comparators are used to compare the sizes of two or more input signals (usually voltage or current signals) and output a high or low level signal based on the comparison results. It usually consists of an operational amplifier (Op-Amp), and when the input voltage exceeds a certain threshold, the output of the comparator quickly switches to one of the saturated states. It is essentially a circuit that converts an analog signal to a digital signal, and its working principle is based on the concept of an operational amplifier, but the feedback loop is usually removed to achieve fast response and clear digital output.

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