This article takes the TLV3501 zero-crossing comparator circuit design as an example, and briefly explains the methods and ideas of the zero-crossing comparator circuit design. I hope to help you design the comparator circuit. Zero-crossing comparator circuit The zero-crossing voltage comparator is the basic structure of the voltage comparison circuit, which converts the AC signal into a bipolar rectangular wave of the same frequency. Commonly used to measure the frequency phase of a sine wave. Zero-crossing comparator circuit diagram, as shown below: Zero-crossing comparator circuit design method and steps: The following zero-voltage comparator circuit is designed by itself. The inverting input terminal is grounded, and the 1kHz and 1V sine wave signals are connected to the non-inverting input terminal. The output waveform and voltage transmission characteristic curve are measured and plotted. Design the circuit below (1) OrCAD simulation The scan settings and results are as follows: In order to measure the rise time, the image is partially enlarged Rise time is 0.66us (2) Building a circuit The signal source settings are as follows: Observe the output waveform as follows: Measuring the rise time of this signal with Measure is 2.4us Finally, add some relevant knowledge of the comparator for your reference. The difference between a comparator (also called a voltage comparator) and an operational amplifier: The comparator looks like an op amp in an open-circuit configuration, but the comparator and op amp have many differences in electrical performance parameters. The op amp can be used as a comparator in principle without negative feedback, but the comparator has a faster response speed than the op amp, the transmission delay time is smaller than the op amp, and the TTL can be directly driven without the need of an external limiting circuit. Digital integrated circuits such as CMOS. However, some op amps (eg LM324, LM358, μA741, TL081, OP07, OP27, etc.) can be considered as comparators when the requirements are not high. The basic voltage type of the comparator: The basic circuit types of the comparator are: zero-crossing voltage comparator, single-threshold comparator, single-supply comparator with positive reference voltage, current addition comparator, hysteresis voltage comparator, etc.
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