[time-nuts] Performance verification for time counters
hmurray at megapathdsl.net
Wed Nov 29 17:01:09 EST 2017
leo at leobodnar.com said:
> Now, what would be recognised procedure for sweeping external input pulse
> delay over few hundred ns in a controlled, measurable and repeatable way?
How about using another crystal at a slightly different frequency?
Suppose you start with 10.000001 MHz and divide by 10000000. That will
slowly sweep a pulse. All you have to do is reset the counter at the right
time to get it started at the right phase.
I think you can do something similar with a DDS type generator starting from
an arbitrary frequency. It won't sweep in a simple ramp but will be a
sawtooth pattern where the points on each tooth are at slightly different
offsets that will fill in the whole space if you merge them together.
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