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

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From: Kim Helliwell (khelliwe@acuson.com)
Date: Mon Jan 10 2000 - 13:16:42 PST


Chris Heard wrote:
>
> Here's another...
>
> Use a ground trace in between signal traces to reduce crosstalk....
>
> Chris
>

I'm curious why this is screwy. Is it because:

1. The separation of the signal traces alone (because of the ground trace)
   would be enough to reduce the crosstalk, so the ground trace is not needed, or

2. The ground trace actually contributes more crosstalk.

I assume it's #1. What has been frustrating me with this whole discussion
is the bald statement of the screwy concept, without some explanation
why the concept is screwy. Those of us still learning signal integrity
concepts are left hanging out to dry. I now know a bunch of things that
are considered screwy enough by one person to have it posted here, but
I'd like to know more. At least references so I can look them up would
help; I'm not that lazy!

I'm still wondering *what* the 20H rule is, let alone why it's screwy!

OK, guess that's enough "emporer has no clothes" for me today!

-- 
Kim Helliwell
Senior CAE Engineer
Acuson Corporation
Phone: 650 694 5030  FAX: 650 943 7260

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