What is the main function of the differential voltage of the Schmitt trigger?

Schmidt triggers.

The main function of the differential voltage is positive feedback.

Gate circuit. There is a threshold voltage.

When the input voltage rises from a low level to a threshold voltage or from a high level.

When the threshold voltage drops, the state of the circuit changes. The Schmitt trigger is a special type of gate circuit, and unlike the ordinary gate circuit, the Schmitt trigger has two threshold voltages, which are called positive threshold voltage and negative threshold voltage. The input voltage that changes the circuit state during the input signal rising from low to high is called the forward threshold voltage, and the input voltage that changes the circuit state during the input signal dropping from high to low is called the negative threshold voltage.

The difference between the forward threshold voltage and the negative threshold voltage is called the differential voltage.

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

By using the positive feedback effect of the Schmitt trigger state transition, the periodic signal with a slow edge change can be transformed into a rectangular pulse signal with a steep edge.

As long as the amplitude of the input signal is greater than VT+, a rectangular pulse signal of the same frequency can be obtained at the output end of the Schmitt trigger.

When the input voltage increases from low to high and reaches V+, the output voltage changes abruptly, while the input voltage VI changes from high to low and reaches V-, and the output voltage changes abruptly, resulting in the phenomenon of lag in output voltage change.

The smaller the differential voltage, the more sensitive the privacy is. To excite the flip is to have Schmidt's UOH+UOH- decision. The differential voltage is their difference. That's what it means. Hehe. That's just my understanding. It's too complicated in the book.

Let the voltage in the circuit remain in a steady state.

The differential voltage determines the duty cycle of the output waveform.

Caused by two threshold voltages.

A Schmidt trigger circuit is a waveform shaping circuit in which the output beats between positive and negative saturation when a signal from any waveform enters the circuit, producing a square wave or pulse wave output. Unlike comparators, Schmitt trigger circuits have two critical voltages and form a hysteresis region, which prevents noise in the hysteresis range from interfering with the normal operation of the circuit. For example, the remote control receiving line will use it to shape the sensor input circuit.