RE: [SI-LIST] : Accuracy of HSPICE W-element transmission lines

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From: Larry Miller (ldmiller@nortelnetworks.com)
Date: Mon Nov 27 2000 - 10:53:09 PST


Yes, but have you compared your results (either) with real hardware?

Inquiring minds want to know....

Thanks,

Larry Miller

> -----Original Message-----
> From: David Kaiser [SMTP:david.kaiser@mcdata.com]
> Sent: Monday, November 27, 2000 10:17 AM
> To: Keskinen, Kai [KAN:0G15:EXCH]; si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : Accuracy of HSPICE W-element transmission
> lines
>
> I have compared the W-element with the RLGC matrix from running APSIM on
> 100 Ohm diff'l pairs). With a 30ps pulse and 10ps rise times, the
> reflected pulse was very symetrical for the W-element, but showed and RC
> roll off with APSIM. The APSIM seemed to shown a more realistic reflection
> pulse.
>
> David Kaiser
> McDATA Corp.
> 310 Interlocken Pkwy.
> Broomfield, CO 80021
> (303) 460-4431
> davidk@mcdata.com
>
>
>
> -----Original Message-----
> From: Kai Keskinen [mailto:keskinen@nortelnetworks.com]
> Sent: Thursday, November 23, 2000 11:19 AM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : Accuracy of HSPICE W-element transmission lines
>
>
>
> Hello SI-People:
>
> We have now several times encountered differences in results from
> other modelling packages and results from HSPICE w-element models for
> applications involving fairly long striplines > 30cm on FR4 and GETEK
> with 2.5Gbps signals with ~100ps edge rates. The W-element model appears
> to give lower loss than the other techniques. Typical track widths are 6-8
> mils with 100Ohm loosely coupled differential pairs.
>
> Avant! claims the W-element method is accurate without providing a
> paper showing how it was validated.
>
> How does the rest of the SI community feel about the accuracy of the
> W-element model?
>
> Thanks in advance,
>
> Kai Keskinen
> Equipment and Network Interconnect
> Nortel Subsystems and Performance Networks (NSPaN)
> (613)-765-3506 (ESN 395)
> keskinen@nortelnetworks.com
>
>

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