[SI-LIST] Re: Phase jitter vs. period jitter

  • From: "Michael Rose" <mrose@xxxxxxxxxxxx>
  • To: <jswarrier@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 24 Aug 2006 18:32:50 -0400

Jai,

no simple answer - jitter can be very complex to translate between =
domains. Phase noise is better in that it can be evaluated for a =
particular spectrum of interest including cycle-to-cycle (and most =
commercial PLL-based clock drivers have jitter features from Hz to MHz). =
Checkout Wavecrest site, they have lots of good jitter material. Many =
clock driver vendors use their analyzers to measure phase noise.

Mike

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Jai Shanker
Sent: Thursday, August 24, 2006 11:31 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Phase jitter vs. period jitter


Hello,

I am evaluating 2 clock drivers for a project from
different manufacturers and found that one specified
phase jitter in ps, (RMS) and the other period jitter
in ps, RMS.=20

The spec for phase jitter was not phase noise or in
dBc/Hz. It helpfully adds that the cycle-cycle jitter
on its input will equal the output, the part wont add
jitter.

I searched SI-list and couldnt find much info. Could
somebody help provide some tips on how they compare/
correlate.

I did get some complex discussion involving
convolution and integrals. If it can only be
understood at that level (rather beyond me :-)) pls
let me know.=20

I am now studying a Corning apnote on VCXO phase
jitter  that is reasonably OK, but would appreciate
any tips.

Thanks & regards,
Jai Shanker W.
ACI Pvt Ltd


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