[SI-LIST] Re: Looking for good source of information regarding Via tuning
- From: Tatsuji Sakurai <weissbierjp@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 15 Jul 2008 19:01:12 +0900 (JST)
Hello,
This article "controlled impedance vias" was looked very
interesting, however I have failed at the early stage of
this article. I just simply did not understand "arc-cosh
(D/2a)" where D is diameter of via, 2 is via pitch between
sig via and GND via. If I apply typical design rule to
this formula, D/2a would be value less than 1. To make
this number more than 1, the design would be unlikely, I
think.
How do I understand this formula? Or imaginary number
would be accepted in the arccosh?
Can somebody explain?
- Tatsuji
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of todd t
Sent: Thursday, July 03, 2008 8:21 AM
To: Denomme, Paul S.
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Looking for good source of
information regarding Via tuning
Paul, perhaps this article is of interest to you:
http://www.edn.com/index.asp?layout=article&articleid=CA324403
"designing controlled impedance vias", by tommy neu, TI.
not a replacement for a tried and true simulation study
with a 3d field solver, but you'll be more familiar with
what you're after and a general direction on how to get
there.
ciao,
-todd t
-mantaro networks
On Jul 2, 2008, at 1:55 PM, Denomme, Paul S. wrote:
> 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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--
=todd=
"be who you are and say what you feel, for those who mind,
don't
matter, and those who matter, don't mind" --dr. seuss
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