The relationship between phase noise and Allan variance is a complex one and was described in papers at FCS in 1976 and 1978 by my previous manager Mike Fischer (then of HP). I think these papers come closest to answering your question.
Rick Karlquist Jeff Mock wrote: > This is a half-baked idea I've thinking about for awhile. I wonder if > it might be possible to create a single measurement to combine allan > variance and phase noise in the same plot. Allan variance usually plots > tau in seconds on the x-axis. Instead, you might plot 1/s or frequency > on the x-axis. This way, allan variance looks more like very close-in > phase noise. > > For example, a point where tau=1000s becomes the phase noise at 1mHz > (milli-hertz) from the carrier. Combining this with more typical phase > noise measurements, you can create a single log-log graph covering > micro-hertz to hundreds of kilo-hertz. The advantage of combining the > measurements into a single entity is that you get most of the > characterization parameters for a timebase in a single graph. > > Would this work? Half-baked, I know... > jeff > > > Shane wrote: >> Do you know much about the R&S FSUP50? >> >> http://www2.rohde-schwarz.com/en/products/test_and_measurement/product_categ >> ories/spectrum_analysis/FSUP-%7C-Key_Facts-%7C-4-%7C-966.html >> >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >> Behalf Of Bruce Griffiths >> Sent: Tuesday, March 25, 2008 8:22 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Close-in phase noise measurements >> >> Shane wrote: >>> Wenzel has a setup you can purchase at low cost. >>> >>> http://www.wenzel.com/pdffiles1/PNTS%201000/BP-1000-SC.pdf >>> >>> Phase noise test sets can be pricey... $200K >>> >> Shane >> >> Their calibration method is somewhat problematic at the low frequency >> end where the effect of the PLL and the audio amplifier low frequency >> cutoff may be significant. >> The NIST calibration technique: >> http://tf.nist.gov/timefreq/general/pdf/1000.pdf is far superior. >> >> Bruce >> > > > _______________________________________________ > 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.
