[SI-LIST] Re: How do two Random (Gaussian) Jitter specs add?
- From: "Mark Randol" <Mark.Randol@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 14 Apr 2006 11:42:07 -0700
Thread drift: Some measurement comments. =20
Agilent's note that Art mentioned looks like it covers their offerings.
Other manufacturers have solutions too. =20
Lecroy also makes a real-time scope based jitter hardware & software
solution.
Wavecrest makes TIA (Time Interval Analyzer) based boxes. =20
Aeroflex has a phase noise measurement system that has a widget that
will calculate the jitter for you. Tek's RSA line has software
available that can do the same thing from a spectrum analyzer based
phase noise measurement. =20
I've convinced myself that Rj is well measured using a phase noise
technique, once the spurs are identified and 'removed'. For very low
jitter (<2ps rms, wideband) Rj clocks, it's the only way that seems to
work. Dj from phase noise is another story...
Most of the mentioned equipment vendors have app notes covering both
jitter in general and their measurement techniques in particular. Many
device vendors have notes as well, both general and product specific.
--
Mark Randol, RF Evaluation & Application Engineer
ON Semiconductor
901 S. Mopac Expressway
Barton Oaks IV, Suite 343
Austin, TX 78746
512-329-5640 (voice), 512-329-8151 (FAX)
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