Javalab [Javalab] Lars Drud Nielsen
ldn@oersted.dtu.dk

Schmitt trigger

In the (normal) case of a large open-loop gain of the opamp (typically >100 dB) the positive feedback will always force the opamp into a saturated state. The hysteretical changes of state take place at the input voltages ±VT (the trip voltages). In the limit of very large gain VT will be determined solely by the resistance values.

For small values of the open-loop gain the closed-loop gain (or RTG = round trip gain) can be < 1. The circuit will then within a limited interval of input voltages (±VT) act as an ordinary linear amplifier.

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