Discussion
What does hysteresis added around a comparator provide?
Answer: A
A little positive feedback moves the threshold after each transition, so a noisy input crossing slowly cannot cause the output to chatter. Offset, common-mode range and speed are unaffected, though the switching does become cleaner rather than faster. The amount needed follows from the expected noise amplitude, which makes it one of the few design parameters chosen directly from a measurement of the environment.
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