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

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From: Jim_Foppiano@Dell.com
Date: Thu Dec 16 1999 - 06:38:13 PST


All,
 
Charles Grasso has done me a big favor and placed the W element simulation
of Fibre Channel presentation at the following location for download. Both
the
original power point format as well as the pdf format are available. Thanks
to
Dmitri Kuznetsov for supplying the pdf conversion to me.
Regards,
 
Jim
 
 
http://www.ewh.ieee.org/r5/denver/rockymountainemc/fibrechannel/download.htm
<http://www.ewh.ieee.org/r5/denver/rockymountainemc/fibrechannel/download.ht
m>

-----Original Message-----
From: Ron Miller [mailto:rmiller@Brocade.COM]
Sent: Wednesday, December 15, 1999 6:32 PM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : W element correlation with measured data

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 <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

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