Re: [SI-LIST] : No buried/embedded capacitance?

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From: Doug Brooks (doug@eskimo.com)
Date: Fri Sep 22 2000 - 12:43:58 PDT


>
>
>Another factor is skin effect. The planes are far more resistive at
>100MHz and 1GHz than you have modeled. Only the skin of the copper
>planes is conductive. This greatly reduces the Q and therefor the
>peaks shown in the simulation.

What (approximate) resistance value would be appropriate for planar
capacitance in the several hundred MHz area?

>Bottom line is that you need a plane simulator that accounts for the
>distributed nature and the frequency dependent loss of the power planes
>to do power distribution analysis above 100 MHz.

Out of curiosity, what do plane simulators cost? Whose do you use?

Doug Brooks

.
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.
Doug Brooks, President doug@eskimo.com
UltraCAD Design, Inc. http://www.ultracad.com

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