Re: [SI-LIST] : Plane Splits Inspection

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From: Chris Padilla (cpad@cisco.com)
Date: Thu Nov 09 2000 - 06:43:38 PST


I do not agree that interplane capacitance = discrete capacitance in as far
as the bandwitch in which the capcitors functions LIKE A
CAPACITOR. Mounting inductance always limits this in the discrete case so
the solid plane should work at much higher frequencies than the stitching caps.

----->Chris

>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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