Oh, yes, you're right. 100pS is the noise. Very interesting in this case: how this high resolution is obtained (excluding averaging, the real hardware resolution)? Analog interpolators? Wave union TDC? Vernier delay lines? I haven't found any reference in the internet...
On Thu, Oct 13, 2011 at 11:10 PM, ws at Yahoo <warrensjmail-...@yahoo.com>wrote: > You missed something somewhere > The Tbolt's RMS noise is 100 ps for the phase and 10 ps noise on the PPT > using unfiltered one second data. > These include the RMS sum of several noise sources. > The resolution is sub ps. > The noise is much greater than the resolution so averageing works fine > > ws > ************ > Azelio Boriani azelio.boriani at screen.it > > > OK, so the Tbolt hardware resolution is 100pS. If you have a hardware > resolution of 100pS and do an average over the data, yes, you can obtain > greater resolution but your data has to cross the 100pS boundary to have > any > variation. If your phase moves under the 100pS window your averaging can > only say that the phase has not crossed the 100pS boundary by an arbitrary > lower resolution obtained with averaging. Of course all must be stable. > Maybe the trick is to use a sampling oscillator that is not so stable so > that it can move the 100pS window to reveal if the phase is near one edge > or > the other and "feed the average" with numbers that are not all the same. > > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ 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.
