For boards with planes on the outside layers, surface mount components
especially will cause problems, as the planes need to be cleared away to
make pads for soldering. If the components are closely spaced, or if the
component itself is long (a large IC or connector), there can easily be a
large slot in the plane.
The other thing I have seen is a desperation move by the PC designer who is
running out of room to run traces. It is very tempting to run a trace on a
plane layer, which then causes the plane to be to be cut.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA, USA
[email protected]
Sent by:
[email protected] To
[email protected]
cc
01/16/2008 03:27
AM Subject
Gnd/Pwr Planes
What are some of the causes that create breaks or slots in ground or power
planes in multilayer boards? Voltage partitioning comes to mind and closely
spaced vias. Others?
Thanks
-
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected]
Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected]
David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
