Hi
> On Jul 27, 2015, at 1:28 PM, Charles Steinmetz <[email protected]> wrote: > > Bob wrote: > >> In tis case the question is "do you *need* low harmonics in the oscillator >> stage to get low phase noise?" > > Note that there are actually two questions. One is WRT the phase noise of > the oscillator itself, and the other WRT the phase noise of a system that > integrates the oscillator. In particular, even harmonics in the oscillator > proper generate additional phase noise in the system when the signal is > AC-coupled and/or DC-restored, and when it is fed to a zero-cross detector or > other circuit that is sensitive to the symmetry of the waveform. > > NIST published a paper on this.[1] There is other research describing and > quantifying the phenomenon, as well. Ok, *but* that’s really an issue with a *destination* circuit rather than the *feed* circuit. What they are talking about are zero cross errors rather than phase noise. Put another way: Phase noise is L(f) What they are talking about are time errors. Bob > > Best regards, > > Charles > > > [1] "The Effect of Harmonic Distortion on Phase errors in Frequency > Distribution and Synthesis," Walls and Ascarrunz > <http://tf.nist.gov/timefreq/general/pdf/1437.pdf> > > > > _______________________________________________ > 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.
