Re: [SI-LIST] : Fast edges with limited plane capacitance

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From: Vinu Arumugham (vinu@cisco.com)
Date: Fri Mar 17 2000 - 11:07:12 PST


Larry Smith wrote:

>
>
> To directly answer Mark's questions, with the same amount of noise
> stimulation, there will be much more noise between the 40 mil power
> planes than between the 4 mil planes, in fact 10X. The reason is
> because of the increased impedance.
>

Doesn't increased power distribution impedance equate to slower logic transition times? If so, the amount of noise stimulation is not the same. If the design's timing margin allows for slower edge
rates, would 40 mil planes not be better than 4 mil planes?

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