Schmidt inverter also has two stable states, but different from general flip-flops, Schmidt inverter adopts potential trigger mode, and its state is maintained by input signal potential; Schmidt inverter has different threshold voltages for input signals with negative decreasing direction and positive increasing direction.

Function:

It is a threshold switch circuit with abrupt input-output characteristics. This circuit is designed to prevent the change of output voltage caused by the slight change of input voltage (below a certain threshold).

The periodic signal with slow edge change can be transformed into a rectangular pulse signal with steep edge by using the positive feedback during the state transition of Schmidt inverter. As long as the amplitude of the input signal is greater than vt+, the rectangular pulse signal with the same frequency can be obtained at the output end of Schmidt inverter.

when the input voltage increases from low to high and reaches V+, the output voltage suddenly changes, while the input voltage Vi changes from high to low and reaches V-, and the output voltage suddenly changes, so the output voltage changes slowly. It can be seen that it is especially suitable for circuits that require a certain delay in starting.