[SI-LIST] risetime effects of plane breaks
- From: Doug Smith <doug@xxxxxxxxxx>
- To: SI-List <si-list@xxxxxxxxxxxxx>
- Date: Sat, 08 Jan 2005 17:19:40 -0800
I think most of us know not to route signals over plane breaks on PWBs
as all kinds of bad things can happen when this occurs in a layout.
But, how do you convince co-workers or your boss that a new design
needs to avoid doing this even if added expense or project delay is
required? Experimental data can be the key and this month my Technical
Tidbit shows what happens to signal risetime if the signal crosses a
plane break.
Crossing Ground Plane Breaks - Part 4
Risetime Effects on Signals
Abstract: Signals that cross ground plane breaks on printed wiring
boards (PWBs) experience degradation as well as cause EMI problems.
Significant degradation of signal risetime is shown to occur, even
with a relatively small ground break of five cm at risetimes on the
order of 300 ps.
The link to the article is the picture of the experimental test setup
at the bottom of the home page at http://emcesd.com .
Doug
--
-------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 1457
========= Los Gatos, CA 95031-1457
_ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
/ /\ \ ] / /\ \ Mobile: 408-858-4528
| q-----( ) | o | Email: doug@xxxxxxxxxx
\ _ / ] \ _ / Website: http://www.dsmith.org
-------------------------------------------------------
------------------------------------------------------------------
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:
