Re: [SI-LIST] : 20H Revisited

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From: Sainath Nimmagadda (sainath@lsil.com)
Date: Thu Jan 13 2000 - 09:40:34 PST


Interesting! What SI issues have to do with fields anyway.

Sainath

Michael Vrbanac wrote:

> D.C.
>
> re: change in orientation of the fringing fields
> Yes. That's a very good point.
>
> re: Vss plane being cut back instead
> In the original application of the 20H rule, it probably wouldn't have mattered.
> In later applications (and alterations) other than the original, it might have mattered.
>
> As as side note:
> The original 20H rule came out of a "field" problem being solved. From
> that standpoint, it might have actually been true to some extent to have
> called it a "screwy SI rule" because it really wasn't an SI problem to begin
> with. Knowledgeable folks dealing with SI issues would never have
> classified the original use as an SI issue. Subsequent uses of the 20H rule
> may indeed have blurred the lines a bit.
>
> Michael E. Vrbanac
>
> "D. C. Sessions" wrote:
>
> > Keeping in mind that There Is No Ground, what happens if
> > the Vss plane is the one cut back?
> >
> > As an alternate consideration, note that the stepback would
> > change the orientation of the fringing fields, which would
> > interact with the enclosure to potentially limit net radiation.
> >
> > --
> > D. C. Sessions
> > dc.sessions@vlsi.com
> >
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