Differential circuit
The circuit structure is shown in Figure W-1. The differential circuit can convert a rectangular wave into a sharp pulse wave. The output waveform of this circuit only reflects the abrupt part of the input waveform, that is, only the moment when the input waveform is abrupt. There is no output for the constant part. The width of the output spike waveform is related to R * C (that is, the time constant of the circuit). The smaller the R * C, the sharper the spike waveform, and vice versa. The R * C of this circuit must be far less than the width of the input waveform, otherwise it will lose the effect of waveform transformation and become a general RC coupling circuit. Generally, R * C is less than or equal to 1/10 of the width of the input waveform Okay.

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