Difference channel can convert an input square wave into a sharp pulse wave.

2. The resistor of the integrating circuit is connected in series in the main circuit, and the capacitor is in the main circuit.

Differential is the opposite.

3. The time constant t of the integrating circuit should be greater than or equal to 10 times of the input pulse width.

The time constant t of difference channel should be less than or equal to110 times of the input pulse width.

4. The input and output of the integrating circuit are integrated.

Difference channel's input and output are differential.