Re: [SI-LIST] : HSPICE W-element and skin effect

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From: Sunil Kumar (sunilb@cdotb.ernet.in)
Date: Mon Sep 11 2000 - 11:39:52 PDT


Scott.

That may be true, as I have manual for 1999.4. I will check in the new
manual.

Thanks

Sunil

On Mon, 11 Sep 2000, Scott McMorrow wrote:

> Sunil,
>
> I believe that the RISETIME option is no longer necessary in 2000.2.
> Skin effect calculations are based upon the frequency content of
> the waveform being propogated.
>
> regards,
>
> scott
>
> Sunil Kumar wrote:
>
> > Hello everybody.
> >
> > I am simulating a gigabit (1.25Gbps) link in HSPICE 2000.2 by modeling a
> > transmission line with W-element. I am using 18mil coupled
> > (differential) microstrip. According to the manual, the skin effect is
> > calculated by using RISETIME option. I have used different
> > values for RISETIME e.g. 50ps, 100ps, 600ps, but I am not seeing any
> > difference in the eye diagram. Can anybody explain this? Where am I making
> > a mistake? How exactly does HSPICE calculate the skin effect for
> > W-element?
> >
> > In case of U-element, skin resistance is calculated for
> > f=1/(15*risetime), and this value is added to the dc resistance to get the
> > effective resistance. The resulting equivalent resistance depends on one
> > frequency; it does not depend on various frequency components in the
> > edge. I beleive this not is not an accurate model for simulating lossy
> > lines. In the W-element it is not mentioned how it calculates skin effect
> > resistance. Any comments?
> >
> > Thanks in advance for any help.
> >
> > Sunil Kumar Ph: 91-80-2204616
> > Research Engineer Fax: 91-80-2263256
> > ATM Group Email: sunilb@cdotb.ernet.in
> > Switching BII
> > C-DOT
> > Sneha Complex
> > 71/1 Millers Road
> > Bangalore-560052
> > Karnataka
> > INDIA
> >
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> --
> Scott McMorrow
> Principal Engineer
> SiQual, Signal Quality Engineering
> 18735 SW Boones Ferry Road
> Tualatin, OR 97062-3090
> (503) 885-1231
> http://www.siqual.com
>
>
>

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