When the product of the differential resistance and capacitance of the differential circuit is less than the period of the square wave, the integrating circuit generates a triangular wave signal. When the product of the integrating circuit, integrating resistor and capacitor is larger than the period of the square wave, a sharp pulse signal is generated.

Purpose of sharp pulse wave: Differential circuit can convert rectangular wave into sharp pulse wave. Difference channel is mainly used in pulse circuits, analog computers and measuring instruments to obtain the information contained in the leading and trailing edges of pulses, such as extracting time-base standard signals. The output waveform of the pulse circuit only reflects the abrupt part of the input waveform, that is, it is only output at the moment when the input waveform is abrupt. And the constant part has no output.