[SI-LIST] Re: 6 port via

  • From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
  • To: <dsaras68@xxxxxxxxx>
  • Date: Wed, 30 Aug 2006 18:20:33 -0700

My guess is that someone is trying to provide you a via model suitable
for typical simulations that have a single victim with 2 aggressors.
The model may or may not have significant coupling between the
aggressors and victim - the "aggressors" may simply be copies of the
2-port model.  The way to check is to shoot a signal into one of the
ports and check the amplitude on the other ports.  If they're all
approximately the same (and equal to the input amplitude), you have the
via configuration described below.  If only one is approximately equal
to the input amplitude, and the other 4 are significantly less (or
zero), you have the scenario I'm describing.

Just guessing though...

If it's truly someone providing a via model for a star configuration, I
would question their wisdom/sanity - the via effects are going to be
trivial compared to running 5 T-lines out of a single point.

Obligatory Disclaimer:
The content of this message is my personal opinion only and although I
am an employee of Intel, the statements I make here in no way represent
Intel's position on the issue, nor am I authorized to speak on behalf of
Intel on this matter.

Jeff Loyer

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ihsan Erdin
Sent: Wednesday, August 30, 2006 5:58 PM
To: dsaras68@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 6 port via

Dharmendra,
If the signal has a star configuration distributed from a through-hole
via
-possibly on different signal layers- a multiport via makes sense to me.

Regards

Ihsan

On 8/30/06, dharmendra saraswat <dsaras68@xxxxxxxxx> wrote:
>
> I always thought that a via is a two-port device, till I encountered
the
> term '6 port multilayer via'. Can somebody throw light on how could a
via be
> made to have more than 2 ports.
> Thanks
>
> Dharmendra
>
>
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