[SI-LIST] : removal of non-functional pads on signal layers

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From: Sean Murray (seandm@mmspec.com)
Date: Fri Jan 26 2001 - 14:59:02 PST


I'm reading through one of Mark Montroses EMC books, and he states "All
unconnected vias must be removed from the artwork prior to production of the
film. An unconnected via is defined as a pad on a plated through-hole that
has no physical connection to any trace on any signal layer. This
requirement does not apply to intentionally implemented ground vias that are
provided for layer jumping RF return current."

Does anyone even do this, where they leave the ground pins(return paths) for
the signals on the film layers for signals?? I always removed all
non-functional signals, but do see how leaving the gnd vias in could be of
benefit (theoretically). Is this theory widely practiced on HS boards?

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Ray Anderson
Sent: Friday, January 26, 2001 11:43 AM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : si-list malfunction last night

Anyone who issued commands to majordomo@silab.eng.sun.com or
tried posting to the list between last night at around 8pm (pst)
until this morning at around 9 am may not have been successful
in their commands or posting.

Due to a local problem on our LAN some of the libraries the Perl
interpreter looks for in the execution of the majordomo software
were not accessible which caused varied malfunctions. Hopefully
things are back to normal now.

-Ray

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