[SI-LIST] Re: Proximity effect and the HSPICE w-element field solver

Scott,

Can you share your findings with HSPICE 2001.2 W-element transmission line?
Thanks.

Zhiping

Scott McMorrow wrote:

> Chris,
>
> The new version of the field solver in HSPICE 2001.2 does correctly
> include all effects.  Just remember that your dielectric material, FR4,
> is not as accurate as your field solver.
>
> scott
>
> --
> Scott McMorrow
> Principal Engineer
> SiQual, Signal Quality Engineering
> 18735 SW Boones Ferry Road
> Tualatin, OR  97062-3090
> (503) 885-1231
> http://www.siqual.com
>
> chris.h.simon@xxxxxxxxx wrote:
>
> > I have searched the SI-LIST archives and actually came across a thread
> > on the HSPICE w-element field solver from June of this year.
> > Unfortunately the responses in the thread did not address the original
> > question.  (They did, however give lots of useful information on
> > dielectric loss of FR-4)
> >
> > At any rate I am beginning a system design which will use 2.5 Gbit/sec
> > differential signalling with Infiniband type of signal
> > characteristics.  My question is whether the HSPICE internal field
> > solver (which I have not yet used) includes the effects of proximity
> > of differential lines when it calculates the line losses.  I assume
> > that when two PWB traces are "tightly coupled" as has been discussed
> > in this forum, the currents in the traces at high frequencies crowd
> > towards the surface due to skin effect AND crowd towards the near
> > edges of the traces due to proximity effect.  Does anyone know of any
> > good resources that specifically discuss the proximity effect at GHz
> > frequencies?  I would think that for signal edge rates on the order of
> > 50 ps this could have a profound effect on losses.
> >
> > Several years ago I used a tool called SIMIAN out of U Texas which I
> > believed included proximity effect.  If the HSPICE field solver does
> > not include these effects does anyone know of another tool which does?
> >
> > Chris
> >
> > <>-<>--<>----<>------<>--------<>--------<>--------<>------<>----<>--<>-<>
> >   Chris Simon                      chris.h.simon@xxxxxxxxx
> >   General Dynamics Information Systems
> >
> >   To an optimist, it's half full.
> >   To a pessimist, it's half empty.
> >   To an engineer, it's twice as large as necessary.
> > <>-<>--<>----<>------<>--------<>--------<>--------<>------<>----<>--<>-<>
> >
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