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Compare the comparator and Schmitt trigger.
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Solution:

comparator schmitt trigger
feedback is not used op-amp operates in an open loop configuration. Positivefeedback is used
For an ideal comparator the upper and lower trigger levels happen to be at zero volts or at the Vref. The upper and lower trigger levels have distinct values.
The output voltage can be either $+V_{\text {sat or - Vat }}$ The output voltage conn be either Heat or -Vat
For an ideal comparator hysteresis voltage is zero $V_H=V_{U T}-V_{L T}$. A nonzero hysteresis is present.
zero crossing detector, window detector. To convert any waveform to a square wave.
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