[SI-LIST] Re: How can I simulate the influence of power plane noise on the signal trace ?
- From: steve weir <weirsi@xxxxxxxxxx>
- To: jgxian@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 13 May 2005 10:43:00 -0700
Jia, if you assume that:
1. The geometry of each line is identical
2. The noise does not violate the CM range of the receiver,
3. The CM rejection of the receiver is perfect
Then you will not see any effects whatsoever. Put in more realistic models
for each point above and you will find:
1. Differential noise injection
2. Very bad if this happens, don't let it!
3. Increased jitter
For these reasons, it is a poor idea to reference high performance links
against multiple voltage rails. It doesn't mean that you cannot do it
successfully, but it does mean that you have a lot of additional homework
to do, and may not be able to meet a given performance target.
Steve.
11:47 AM 5/13/2005 +0800, Jia Gongxian wrote:
>Dear all,
>
>I'd like to simulate the influence of power plane noise on the signal
>traces, which are differential stripline, using the power plane as one
>reference plane.That is,
>
> ----------------------------------- ground plane
>
> --- --- differential traces
>
> ----------------------------------- power plane + noise
>
> Any suggestions will be welcome.
>
>Thanks.
>
>Jia Gongxian
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