Dear Magnus, With your kind permission I (totally ) disagree with you . We make 10 GHz oscillators which are almost getting close to the Poseidon Sapphire , but the post power amplifier at 10 Ghz has a much higher noise floor then the source . I have not yet solved the problem My new FSWP (R&S) Analyzer can measure down to - 190dBc/Hz . Wish me luck, Ulrich In a message dated 7/13/2015 5:29:50 P.M. Eastern Daylight Time, [email protected] writes:
Dear Ulrich, Indeed. I think it's really not meaningful of saying it is additive, just as it is not meaningful to say residual. Any buffering/amplifying stage will add phase noise (and amplitude noise). We will have conversion between AM and PM to some degree. For higher quality stuff, the levels are very low such that qualitative measurements becomes very hard, at least compared to oscillator measurements, also it is to it's nature a differential measurement, so the topology will be different. The most sensitive measurements I've seen use interferometric or cross-correlation techniques, as Enrico shown. You have any further insights? Cheers, Magnus On 07/13/2015 03:10 PM, KA2WEU--- via time-nuts wrote: > This is a misnomer, it should be called "additive"phase noise. Think of a > "noise free" oscillator with a buffer stage. This stage because of AM/PM > conversion under large signal condition adds noise, makes the over all system > noisier.. > > Ulrich Rohde > > > In a message dated 7/13/2015 8:31:19 A.M. Eastern Daylight Time, > [email protected] writes: > > > Hi all, > > I am looking on Wikipedia a description of the Residual Phase Noise but > this page do not exist. > Can some one of the time-nuts expert write a full description of this > physical aspect for Wikipedia? > > thanks, > > Luciano > [email protected] > www.timeok.it > > > Message sent via Atmail Open - http://atmail.org/ > _______________________________________________ > 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. > > _______________________________________________ > 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. > _______________________________________________ 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. _______________________________________________ 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.
