RE: [SI-LIST] : Attenuation on a PCB trace

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From: Ray Anderson (Raymond.Anderson@Sun.COM)
Date: Mon Apr 23 2001 - 14:48:15 PDT


Dave-

Yes, our group has modeled the rise time degradation in simulation using the
Hspice W-element and have achieved reasonable model to hardware correlation.

When using a microstrip model, the fields propagated through the dielectric
and through the air are accounted for in the model, so I don't think you
really want/need to kluge up a model that utilizes a stripline and an
airline to do the simulation.

-Ray
Sun Microsystems Inc.

>
>
>I interested in whether on not anyone has modeled this degradation of rise
>time (see excerpt below) that Mike has mentioned using a simulator. Can it
>be done by building two transmission lines in the simulator, one for air
>dielectric and one for FR4? If the two parallel transmission line method
>works how would one calculated how much impedence to allocate to each
>dielectric? Will a field solver tell you this?
>
>Dave Lorang

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