Stanley Reynolds wrote: > Bruce > This counter may be close : http://www.psplc.com/datasheets/vigo/VOITC-200.pdf > or http://ztc.wel.wat.edu.pl/kalisz/T-2300R.pdf > Stanley > > > Stanley
Much better but still inadequate for characterising good oscillators, at least for short averaging times. Its actually not too difficult to achieve 25ps or better resolution with a suitable interpolator. You can actually achieve better resolution with an analog phase comparator. The only constraints being that the frequency difference between the 2 sources being compared isnt too large and that such comparators have deadbands towards the end of the range. The latter constraint can be overcome by using a pair of linear phase comparators driving the second with one of the signals in quadrature with the corresponding input to the first comparator. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
