RE: [SI-LIST] : Plane Splits Inspection

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From: abe riazi (ariazi@serverworks.com)
Date: Fri Nov 10 2000 - 09:58:38 PST


Michael Nudelman: Wrote:

>Have you tried putting caps not across the split, but from the edge of >every
>split to the solid plane?
>By putting them across the split you, though eliminating discontinuity,
>defeat the effect of split plane (planes are split not just for the sake of
>voltage difference but also for noise reduction, like analog/digital,
>hi-speed/digital, etc), introducing the noise from more noisy plane to >the quiet one.

It seems to me that the latter method (i.e. putting the caps from edge of every split to solid plane) can increase number of required vias. The inductive effects due to closely spaced vias can then produce undesirable effects.

Abe

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