My dim memory says there is some analog way to multiply the phase noise. What does that? Then it might be easier to measure.
On Wed, Jun 12, 2013 at 2:36 PM, Marek Peca <ma...@duch.cz> wrote: > My point was, that DSO is basically an ADC. Therefore, there is some >>> amount of noise, nonlinearity and drift, limiting the jitter measurement. >>> Do you think any method can dig more information from given data than >>> sinc() interpolation and zero-crossing computation? >>> >> > The cross-spectrum averaging does indeed do just that, relying on two >> ADCs to produce uncorrelated noise, which can be averaged out. >> >> Or am I misunderstanding your point? >> > > Nothing against that. It depends on what noise level after averaging you > require. I only posted my experience with a very low-quality DSO, which has > 100psRMS single-shot. Using sinc() interpolation, but my point was, that I > suppose there is no way to obtain better single-shot performance than this. > To average out 100psRMS to, say, 1psRMS, it would require 10^4 edges (under > the assumption, that the 100psRMS is well behaved noise). > > What performance it could yield with a better scope? I hope I'll try > LC584AL some day, I guess it might give sth like 10psRMS single-shot... > > > Regards, > Marek > ______________________________**_________________ > 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. > -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
