[SI-LIST] Re: Jitter Analysis
- From: "Dima Smolyansky" <Dima@xxxxxxxxxxxxxx>
- To: <khalida@xxxxxxxxxxx>, "si_list" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 11 Feb 2002 15:28:25 -0800
Khalid:
If you can do a TDT (transmission) measurement on the trace, then it is easy
to predict how the eye will be distorted due to deterministic jitter. If you
can only do TDR (reflection), it is still doable but takes more steps. I
will contact you in person for details.
Thanks,
===================
Dima Smolyansky
TDA Systems, Inc.
11140 SW Barbur Blvd., Suite 100
Portland, OR 97219
(503) 246-2272
(503) 246-2282 (fax)
(503) 804-7171 (mobile)
Download new IConnect(R) TDR software demo at www.tdasystems.com/download!
----- Original Message -----
From: "Khalid Ansari" <khalida@xxxxxxxxxxx>
To: "si_list" <si-list@xxxxxxxxxxxxx>
Sent: Monday, February 11, 2002 3:07 PM
Subject: [SI-LIST] Jitter Analysis
>
> Hi all,
>
> I have a driver and receiver talking in an asynchronous
> fashion at 2.64 Gbps. The driver is sending out random
> data over 64 inches of PCB trace (5 mil of around 10" LC
> and 8 mil rest on Backplane). There are a lot of SMAs
> on the path too for connecting traces to each other. Using
> TDR I determined each to be around 1.5 pF of discontinuity.
> My receiver is able to pick this up even though the eye looks
> completely closed due to excessive ISI (thanks to the
> equilization circuitry). I am trying to look at the content of
> the jitter on a WaveCrest jitter analyzer. The WaveCrest
> keeps on complaining, "Measured DCD+DDJ data does not
> appear to match user specified pattern. Sample:2.57e-289
> Limit: 5.00e-001". When I reduce the trace length by about
> 20 inches then a distinguished eye can be seen due to lesser
> losses. This eye I am being able to analyze using the
> WaveCrest.
>
> In past experiences has anyone seen similar behavior.
> What are the limitations of the Wavecrest? I can measure
> the random jitter by cutting down the trace and using the
> Wavecrest but for DJ what should I do? The eye is so closed
> that I can't even get a meaningful result using the histogram
> on the Tek 11801 B scope.
>
> In short, what is the best way for me to find out the amount
> of deterministic jitter on my data. Any ideas will be appreciated.
>
> Thanks in advance,
> Khalid
>
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