Re: [SI-LIST] : What's your favourite Screwy SI Concept?

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From: gedlund@us.ibm.com
Date: Wed Jan 05 2000 - 15:22:05 PST


Sorry - I couldn't resist!

Using root-mean-square to sum noise sources that are not statistically
independent.

Greg Edlund
Advisory Engineer, Critical Net Analysis
IBM
3650 Hwy. 52 N, Dept. HDC
Rochester, MN 55901
gedlund@us.ibm.com

Andrew Phillips <andrew@scs.ch> on 01/05/2000 07:17:07 AM

Please respond to si-list@silab.eng.sun.com

To: SI-LIST <si-list@silab.eng.sun.com>
cc:
Subject: [SI-LIST] : What's your favourite Screwy SI Concept?

Having been following this list for several years now, and coming up
against plenty of signal integrity issues with my work along the way - I
always find it interesting to see how many confused or even totally
bogus, yet often quoted, design 'philosophies' there are floating about
in this field -

e.g. connect a decoupling cap directly to the power/gnd pins of a device
to prevent noise currents from spreading onto the power planes rather
than dropping vias directly to the plane.

I would be interested to hear other people's favourite 'Screwy SI
Concept' - why its screwy and why you think it has hung around in the
literature confusing everybody.

I'll put together a summary if enough people send me stuff.

Cheers,

Andrew Phillips
Supercomputing Systems AG
Zurich, Switzerland

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