[SI-LIST] Re: Looking for good source of information regarding Via tuning
- From: "Chris Herrick" <cherrick@xxxxxxxxxx>
- To: <Paul.Denomme@xxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 3 Jul 2008 02:11:36 -0400
Hi Paul, I?m not sure if this will help your customer but a colleague and I
wrote a program that interfaces with HFSS for exactly this study. It?s
available free at http://3dviadesign.com. It?s basically a wizard that creates
ready to solve via projects so the user doesn?t have to be an expert in 3D
field solvers. The number of vias, padstacks and locations can be arbitrary.
All of the geometry (antipads, pads, dogbone, spacing, backdrilling, etc) is
also parameterized so it?s easy to optimize to a given impedance or frequency
domain criteria. Anyway, not sure if your customer has access to HFSS but I'm
sure this can help if they do.
-Chris
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Denomme, Paul S.
Sent: Wednesday, July 02, 2008 10:56 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Looking for good source of information regarding Via tuning
Hi All,
I have a customer that is looking for assistance in
providing Via tuning. Basically they are looking to minimize the impact
their via's have on their high speed signals. I am familiar with the
various techniques to minimize the impact a via has on the signal
integrity ( ie minimize pad size, maximize anti pad, remove NFP's,
backdrilling, etc) but is their any good source of information on how to
tune a via to a particular impedance? What about software? I'm familiar
with the 3D field solvers, but is their any reasonably priced software
available that will support this type of work? Any assistance on this
issue would be greatly appreciated.
Thank you
Paul Denomme
Viasystems
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