Comparator, a device in which the output value is compared to a specified reference value to produce a difference signal (error signal). Comparing two or more data items to determine if they are equal, or determining the size relationship and ordering between them is called comparison. A circuit or device capable of implementing such a comparison function is called a comparator. A comparator is a circuit that compares an analog voltage signal to a reference voltage. The two inputs of the comparator are analog signals, and the output is a binary signal. When the difference of the input voltage increases or decreases, the output remains constant.
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