Debbie,
Doug Powell explained it as "venting," where slots or holes are added to a
plane in order to let vapor out. However, it is my belief that this is also
done to keep copper balanced during the etching process. I may well be
mistaken, but the EMI and signal integrity concerns we have with the
practice are all valid.
Cheers,
Cortland
====================== Original Message Follows ====================
>> Date: 23-Jan-01 07:25:06 MsgID: 1077-23952 ToID: 72146,373
From: Debbie Mallory >INTERNET:debbie.mall...@fibre.com
Subj: FW: [Fwd: [SI-LIST] : Copper balance]
Chrg: $0.00 Imp: Norm Sens: Std Receipt: No Parts: 1
From: Debbie Mallory <debbie.mall...@fibre.com>
Subject: FW: [Fwd: [SI-LIST] : Copper balance]
List-Post: emc-pstc@listserv.ieee.org
Date: Tue, 23 Jan 2001 07:21:35 -0800
Cortland,
I, too, am having problems passing radiated emissions because of 350Mz
originating from a 50MHz processor that uses a 50MHz oscillator. I thought
I understood thieving until you said you have to put it on the ground plane
also. Can you explain further why and how thieving is applied to the
ground plane?
Thanks.
Regards,
Debbie Mallory
Advanced Fibre Communications
Largo, FL
====================== End of Original Message =====================
-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Jim Bacher: jim_bac...@mail.monarch.com
Michael Garretson: pstc_ad...@garretson.org
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
