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Operational Amplifier as a Schmitt Trigger
The Schmitt trigger works as a threshold switch that turns on the output voltage at a certain input voltage which we call the upper threshold voltage (VUT) and turns off the output voltage at a certain input voltage lower threshold voltage (VLT).
The function of a Schmitt trigger can be well shown by the example of a sine-square converter (here we take a non-inverting Schmitt trigger):
