Re: [SI-LIST] : W element correlation with measured data

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From: Ron Miller (rmiller@Brocade.COM)
Date: Wed Dec 15 1999 - 16:32:00 PST


Dmitri

The web page does not work.

Ron Miller

Dmitri Kuznetsov wrote:

> IMAPS presentation by Jim Foppiano has comprehensive comparison of
> measured time-domain waveforms and W-element simulations for a Gigabit
> transceiver design, including long cables and traces.
>
> A pointer to the presentation was posted on the SI list few months ago,
> I included a copy below. It is still available for download.
>
> Regards,
> Dmitri Kuznetsov
> The W-element Developer
>
> Re: [SI-LIST] : IMAPS Presentation on Simulating Fibre Channel Loss
> From: Tarek Ali - WGS Board Design Technology <Tarek.Ali@East.Sun.COM>
>
> Hi,
>
> If anyone needs to download the imaps presentation please access
> my freedrive account at http://www.freedrive.com.
>
> login: tarek
> password: tarek
>
> And you can download the ppt file from the imaps folder.
> Most email systems will not permit files above 5 Meg, and this
> file is 10 Meg.
>
> Thanks,
>
> Tarek Ali
>
> Bradley S Henson wrote:
> >
> > Hi Ron,
> >
> > I can only speak to the fact that the frequency dependent parameters are now
> > included and look substantially more real. I have not stayed put in one job long
> > enough to actually have my folks characterize this for me! We have some work
> > going on now, but nothing as well designed as I'd specify. The results will
> > likely not be sharable due to the funding source :( Again, I don't think anyone
> > will miss this data much at all since it appears to me to be way too superficial
> > and poorly designed from an experimental viewpoint.
> >
> > If I get a chance to compare 'W' elements to measured data I'll share with the
> > list anything publishable. Unfortunately, I have nothing in the works right
> > now...
> >
> > Brad Henson
> >
> >
> > Ron Miller <rmiller@Brocade.COM> on 12/10/99 11:26:13 AM
> >
> > Hi Brad
> >
> > I am using HP ADS a frequency domain simulator with Impulse, a real time
> > convolution
> > to the time domain with time domain models mixed in. I started using this
> > because of the
> > problem with spice not modeling frequency dependent losses properly for some
> > cable losses.
> >
> > The ADS simulations matched the measured results very nicely. However, the
> > problem
> > with ADS is that the simulations take a long time to run when converting back to
> > the time
> > domain, so they are a bit slow and expecially when having large spice circuits
> > driving and
> > receiving the signals.
> >
> > My question is, does the W element simulations closely match the measured
> > results of
> > cable and long PCB traces?
> >
> > Thanks
> >
> > Ron Miller
> >
>
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--
Ronald B. Miller  _\\|//_  Signal Integrity Engineer
(408)487-8017    (' 0-0 ') fax(408)487-8017
     ==========0000-(_)0000===========
Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA  95131
rmiller@brocade.com,  rbmiller@sjm.infi.net

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