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

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Mon Sep 11 2000 - 04:25:14 PDT


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
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(503) 885-1231
http://www.siqual.com

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