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.
How to use Javalab
About Javalab opamps