Unfortunately, I don't have a DSO, and I don't see any way to capture waveforms with the equipment I have available to me. And then there's the insurmountable problem of not having access to the 120pf cap in the PIC. I may have to just accept it without understanding it. At least success is a good problem to have and not a bad one. I'm sending a board to a friend soon, and if the results repeat for him, it's not just a fluke.
Bob >________________________________ > From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> >To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency >measurement <time-nuts@febo.com> >Sent: Monday, March 10, 2014 5:32 PM >Subject: Re: [time-nuts] Modeling vs reality question re my TIC > > >Charge injection could well account for the offset from the expected >minimum. >There are no forward biased diodes in your circuit. > >It would be helpful to capture the 125 buffer input signal waveforms >(and if possible the timing capacitor waveform) rather than trying to >infer whats going on from the ADC plots. > > >Bruce > > _______________________________________________ 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.