From: Ron Miller (rmiller@Brocade.COM)
Date: Mon Sep 11 2000 - 11:02:56 PDT
Scin effect is not enough.
Above 1 Ghz, Dielectric losses dominate.
For a Data rate of 1.25 GBS, 625 Mhz, 3rd harmonic and 5th harmonic must be considered.
So, you are talking components that cannot be simulated without a frequency domain
simulator that takes into account dielectric losses.
> -----Original Message-----
> From: Scott McMorrow
> Sent: Monday, September 11, 2000 4:25 AM
> To: Sunil Kumar
> Cc: SI List (E-mail)
> Subject: Re: [SI-LIST] : HSPICE W-element and skin effect
> 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.
> 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: firstname.lastname@example.org
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> > Bangalore-560052
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> > INDIA
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> Scott McMorrow
> Principal Engineer
> SiQual, Signal Quality Engineering
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