[SI-LIST] Re: Simulating SI and PI through a "passive" backplane
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Cuong P Nguyen <cuong@xxxxxxxxxxxxx>
- Date: Tue, 02 Mar 2010 21:02:35 -0800
Cuong, as with many things: it depends. If any given signal references
only one rail through the entire channel path, then the PDN never enters
into the picture. If on the other hand signals change or share
references between multiple power rails, then the PDN performance
becomes a big issue, biggest near the transitions.
Steve
Cuong P Nguyen wrote:
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> Anyone has any comments on simulating crosstalk on high speed diff pairs
> running through a "passive" backplane?
>
> The topology is as follow:
>
>
>
> 1. The driver resides on board #1.
>
> 2. This board connects to a passive backplane with only connectors.
> No other components (incl. decoupling)
>
> 3. The receiver is on board #2.
>
>
>
> My question is really on the effects of the GND and PWR planes (on the
> passive backplane) on the diff pairs and
>
> whether or not the crosstalk analysis will be accurately modeled.
>
>
>
> For Power Integrity Analysis, if the driver is on 1st board and receiver is
> on 2nd board and there are 2 connectors
>
> in between (with many pins inter-connecting the PWR and GND of the back
> plane to the PWR and GND of the
>
> 1st and 2nd board), how will the DC drop analyzed?
>
>
>
> Thanks for your feedback.
>
>
>
> ----------------------------
>
> Cuong Nguyen
>
> <http://www.edadirect.com/> edasmall2
>
>
>
>
>
>
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--
Steve Weir
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