[time-nuts] Zero-Crossing Detector Design?

Rick Karlquist richard at karlquist.com
Fri Jul 20 00:47:55 UTC 2012


Chris Albertson wrote:
>
>
> The comparator will work but you need some positive feedback to create
> hysteresis.   The problem is the hysteresis cause the output square
> wave to be not quite 50% duty cycle.  But maybe you don't care if the
> goal is to count cycles. or if you only look at (say) raising edges.
>

Hysteresis does nothing to eliminate jitter or temperature
drift.

Rick





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