RE: [SI-LIST] : Plane Splits Inspection

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From: Zabinski, Patrick J. ([email protected])
Date: Thu Nov 09 2000 - 07:04:30 PST


The discontinuity of a small, adjacent, solid plane was 'better'
than an ideal stitching capacitor (shorting bar), so if you
say the plane had lower inductance than a stitching cap, then
I would agree.


> Patrick,
> Would you agree that your nearby solid plane is basically a large,
> distributed capacitor, performing essentially the same function
> as Abe's stitched capacitors? Admittedly a return current at split
> plane A must pass through the dielectric to the solid plane, across
> a little bit of solid plane, and then back through the dielectric
> to split plane B. But it does form a capacitive coupling that is
> available everywhere; therefore no need to calculate capacitor
> placement. I have not considered capacitance magnitude differences,
> however.
> A separate discussion could be held on what happens to the currents
> induced in the solid plane.
> Mike LaBonte
> Cadence

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