From: Sunil Kumar (email@example.com)
Date: Mon Sep 11 2000 - 11:36:42 PDT
Well..HSPICE takes into account dielectric losses also. The loss tangent
for the material (in my case FR-4) has to be specified for this purpose.
On Mon, 11 Sep 2000, Ron Miller wrote:
> 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.
> Ron Miller
> > -----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
> > 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: firstname.lastname@example.org
> > > Switching BII
> > > C-DOT
> > > Sneha Complex
> > > 71/1 Millers Road
> > > Bangalore-560052
> > > Karnataka
> > > INDIA
> > >
> > > **** To unsubscribe from si-list or si-list-digest: send e-mail to
> > > email@example.com. In the BODY of message put: UNSUBSCRIBE
> > > si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
> > > si-list archives are accessible at http://www.qsl.net/wb6tpu
> > > ****
> > --
> > Scott McMorrow
> > Principal Engineer
> > SiQual, Signal Quality Engineering
> > 18735 SW Boones Ferry Road
> > Tualatin, OR 97062-3090
> > (503) 885-1231
> > http://www.siqual.com
> > **** To unsubscribe from si-list or si-list-digest: send e-mail to
> > firstname.lastname@example.org. In the BODY of message put: UNSUBSCRIBE
> > si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
> > si-list archives are accessible at http://www.qsl.net/wb6tpu
> > ****
email@example.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:29:28 PDT