[SI-LIST] Re: PC board materials
- From: "Nick Langston" <nicksr@xxxxxxxxxx>
- To: <amp46@xxxxxxxxxxx>, "'SI Newsgroup'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 19 Nov 2003 18:30:59 -0800
Here is some info we present to our ATE board customers when they are asking
whether they can use FR4 or Getek or Rogers material. The graph is based on
info from Drs. E. Bogatin and Howard Johnson's books.
http://www.dci-us.com/technical/loss_chart.php
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Anand Mohan Pappu
Sent: Tuesday, November 18, 2003 2:58 PM
To: 'SI Newsgroup'
Subject: [SI-LIST] PC board materials
Hi,
Could someone tell me the difference between different board materials
(like FR4 and TMM3)? Is the only difference the permittivity (Er) of the
board material or is there anything else?
Or in other words, what does a better printed circuit board constitute?
Is it just that lower permittivity leads to lower capacitive coupling
between different traces? Or is there more to it in the frequency domain
- are the rise times of signals somehow affected by the traces of the new
(better) board? Does the resistance of the traces play a role?
*ANY* light on the issue will be gratefully appreciated.
Anand
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