[SI-LIST] Re: Series termination greater than the characteristic impedance?
- From: Doug Brooks <doug@xxxxxxxxxx>
- To: Charles.Grasso@xxxxxxxxxxxx, <aminotg@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 17 Jan 2006 13:22:58 -0800
Whether crosstalk impacts the impedance of the trace depends on the
degree to which the two signals are correlated. If there is no
correlation (i.e. the two signals are randomly distributed compared
to each other) there is no impact. In the limit, with perfect
correlation, we have one of two cases:
(a) differential impedance-type impact (Z = Zo - Z12) if the
correlation is perfect and negative, or
(b) Common mode (Z = Zo + Z12) if there are perfectly positively correlated.
Z12 depends, among other things, on the coupling coefficient between
the traces.
Doug
At 08:48 AM 1/17/2006, Grasso, Charles wrote:
>Crosstalk can dramatically affect the impedance of a trace.=20
>Under certain conditions the impedance will INCREASE and under
>other conditions the impedance will DECREASE from the desired value.
>
____________________________________________________________________________-
Check out UltraCAD's new presentation videos and new skin effect
calculator at http://www.ultracad.com
------------------------------------------------------------------
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:
