From: Doug Brooks ([email protected])
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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Engineer" is now available. See our web site for details.
.
Doug Brooks, President [email protected]
UltraCAD Design, Inc. http://www.ultracad.com
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