[SI-LIST] Re: Jitter Tolerance
- From: "Alfred P. Neves" <al@xxxxxxxxxxxxx>
- To: <ralf.inova@xxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 18 Mar 2010 10:00:49 -0700
Ralf,
The composite mix of DJ-RJ, as specified, is intended to test a CDR to
insure compliance between platforms, such that a minimum BER is achieved in
that system. 10^-12 Bit Error Ratio is a typical number.
Adding a dramatic amount of PJ, within the loop bandwidth of the CDR PLL,
will result in the PLL losing lock in most cases and does not constitute a
interoperability BER type test.
Accordingly, it isn?t quite clear what your objective is. Are you trying
to work around the jitter specification in a BER tolerance type test or are
you trying to measure lock range for jitter transfer?
Measuring Jitter tolerance is not very easy to do properly, and in the
course of our consulting activity, we have unfortunately have seen
incorrectly done test methodology of CDR tolerance testing.
Alfred P. Neves <*)))))><{
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of ralf.inova@xxxxxx
Sent: Thursday, March 18, 2010 2:21 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Jitter Tolerance
Dear Experts,
I found the following Jitter Tolerance Specification for XAUI:
Receiver must be able to tolerate this much jitter
DJ : 0.37 UIp-p
DJ+RJ : 0.55 UIp-p
SJ : additional SJ (on top of DJ+RJ) to limit of mask?
-> 8.5 UI < 22.1kHz
-> 0.1 UI > 1.875MHz (linear fit between these points)
legend:
DJ : Deterministic jitter (includes residual ISI, duty-cycle error, etc.)
RJ : Random jitter ? uncorrelated with any source
SJ : Sinusoidal jitter
Is there any formula or rule of thump, how much SJ the receiver must
tolerate, if one could reduce the DJ and RJ to neglegible values?
Thanks in advance,
Ralf
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