RE: [SI-LIST] : Layout of Bypass Cap

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From: Doug Hopperstad (doug.hopperstad@qlogic.com)
Date: Fri Mar 16 2001 - 11:13:26 PST


Take a look at this web page. It has a good article on Decoupling caps. I
hope it helps.
 
ftp://ftp.qsl.net/pub/wb6tpu/si_documents/epep-98.pdf
<ftp://ftp.qsl.net/pub/wb6tpu/si_documents/epep-98.pdf>

 <ftp://ftp.qsl.net/pub/wb6tpu/si_documents/epep-98.pdf>
Doug Hopperstad
Qlogic

-----Original Message-----
From: Kai Siang [mailto:bigmac@singnet.com.sg]
Sent: Friday, March 16, 2001 12:17 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Layout of Bypass Cap

Hi,
 
A question on bypass caps. How do I place bypass caps ? Do i connect a fat
short trace from the pad of surface mount cap to the supply pin of the IC
and then punch a via to the power plane near this pin ? Or can i place the
cap physically near the supply pin and just punch a via into the power plane
? Which approach is better ?
 
 
Thanks
Kai Siang
 

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