Discussion
Schmitt Trigger is a special configuration of :
Answer: C
A Schmitt trigger is a positive feedback op-amp circuit.
Part of the output is fed back to the non-inverting input, so once the input crosses a threshold the output is driven hard to the opposite saturation level. The feedback shifts the threshold, giving two switching levels (upper and lower trip points) and hysteresis, which makes the circuit immune to noise on slowly varying inputs.
An open loop comparator switches at a single threshold and chatters with noise. Negative feedback produces linear amplifiers, not switching circuits. 'Differential input' describes every op-amp and does not distinguish the configuration.
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