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

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From: Jim Freeman (freeman@broadcom.com)
Date: Thu Dec 16 1999 - 13:36:03 PST


Hi All,
    I was able to access the web page.
Jim Freeman

Ron Miller wrote:

> 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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