John, How where these measurements done? Also, it looks like you have a systematic component in there, about 80 fs guestimating from the plot creating essentially two tracks up the slope that is the tell-tale of a sinuoid phase modulation of some source.
Considering the temperature stability that you nicely plotted as a quadratic shape, it seems like a good thermal stability is needed, which comes as no big chock. Can do you do a longer measurement and accumulate the data in a 2D-histogram fashion? That is count occurrences for the amplitude/time position and then color code it accordingly? That have proved to be a good tool for analysis. Cheers, Magnus On 04/13/2018 05:54 PM, John Larkin wrote: > If you walk the differential data and clock inputs of an NB7V52 CML > flipflop across one another in time, the equivalent jitter is below 20 > fs RMS. That's what we're measuring, but our test rig may well dominate > the jitter, so the flop is probably better. > > We're using this to test the jitter of some of our timing products, with > 1/10 the noise floor and 1e-4 times the cost of other ways to do it. > > https://www.dropbox.com/s/1i2yz7otty94o9l/NB7_Jitter_1.jpg?raw=1 > > https://www.dropbox.com/s/qahpb8uh1xr53vj/NB7_Steps.jpg?raw=1 > > https://www.dropbox.com/s/tpphhi79yxgzy34/NB7_tc.jpg?raw=1 > > _______________________________________________ time-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.