[SI-LIST] Re: ROOKIE: Anti-Pad Size Effect On Signal Integrity: By the formula, as F goes up, Xc goes down (was up by typo)
- From: "David Lieby" <dlieby@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 12 Dec 2006 16:47:05 -0800
Geez,
The guy that started this, some time ago, is probably feeling that his
head had been put in a blender. While we all now understand the
problem, perhaps we should tell him that he should look at hiring a
consultant if he is going over something like 10^8 Hz. =20
We all would like to help him just get a feel for the problem. If it
goes really fast, sometimes you need something outside your expertise.=20
dav0
David Lieby
PS: Please clip out the kruft.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Scott McMorrow
Sent: Tuesday, December 12, 2006 3:43 PM
To: steven.salkow@xxxxxxxx
Cc: chand basha; PaulClarke@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: ROOKIE: Anti-Pad Size Effect On Signal Integrity:
By the formula, as F goes up, Xc goes down (was up by typo)
Steven
Unfortunately, both the the paper and Dr Johnson's work are accurate=20
only in the quasi-static domain. Our work on launches has shown that=20
quasi-static analysis and models for vias are not very useful, except as
a first order approximation. By using full-wave techniques, we can push
via cutoff frequencies up to 40 GHz.=20
We have a few slides on our website under publications that discuss=20
high-performance via and launch issues.
*Evaluation of a Single Via in the Frequency Domain
**Hybrid Solver and Measurement Based Design
**Electrically Transparent 50 Gbps Board-to-Board Interconnect
best regards,
Scott
*
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
Teraspeed(r) is the registered service mark of
Teraspeed Consulting Group LLC
Salkow, Steven wrote:
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
