[time-nuts] 5 MHZ PIC PPS Divider?
james.p.lux at jpl.nasa.gov
Sat Apr 12 11:57:56 EDT 2008
Quoting John Ackermann N8UR <jra at febo.com>, on Sat 12 Apr 2008
07:44:06 AM PDT:
> * I realize that I'll also be limited by counter resolution.
Unless you use some sort of "time to digital" converter. There's some
ASICs out there that do this, and I've seen CPLDs programmed to do it.
The new fancy oscilloscopes from,e.g., Tektronix have this so that
you can measure jitter to finer resolution than the 20Gs/s sample rate.
Seems one could also do a similar Time-to-Digital thing by using the
old vernier counter scheme.. take your 5MHz and create a slightly
offset version (4.9,5.1, or 5.01, etc.) by dividing and mixing and
hook it up to a second counter.
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