[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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