1. Voltage comparator A voltage comparator (comparator for short) is a circuit that compares an analog voltage signal with a reference voltage. (1) Zero-crossing comparator The zero-crossing voltage comparator is a typical amplitude comparison circuit. The circuit diagram and transmission characteristic curve of the in-phase zero-crossing voltage comparator are shown in FIG. (a) Circuit diagram (b) Voltage transmission characteristics Figure 1 Zero-crossing voltage comparator (2) Arbitrary voltage amplitude comparator The input terminal of the zero-crossing comparator is changed from ground to a fixed voltage value UR, and the voltage comparator is obtained. The circuit is shown in 2. Adjustment can easily change the threshold. (a) Circuit diagram (b) Voltage transmission characteristics Figure 2 In-phase arbitrary voltage comparator (3) Basic characteristics of the comparator Working in open loop or positive feedback state; the output of the comparator has only two stable states of high level and low level; non-linear.
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