I used a CPLD in a 900 GHz (that's right 900 GHz) optical sampling scope timebase. It was great because you just write a 17 bit counter in VHDL and there it is. You don't have to know anything about building digital hardware any more (40 years of experience wasted). Nobody cares about look ahead carry, etc. I cleaned up the timing with conventional logic, so I don't know what the jitter of the CPLD was. We needed jitter in the low fs, so I am sure the CPLD was not OK without cleaning up, but then that was a lunatic fringe project. Rick Karlquist N6RK On 6/2/2015 6:13 AM, David C. Partridge wrote: > Is this a sensible thing to consider doing? Or would I be better sticking to AC/HC/AHC/LVC logic? > > Regards, > David Partridge > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > >