> ----------
> From: Mellitz, Richard[SMTP:[email protected]]
> Sent: Tuesday, September 09, 1997 4:40 AM
> To: '[email protected]'
> Subject: RE: [SI-LIST] : skin effect and transmission line
> simulators
>
> Interesting. BGA foot print effects... eh. So how big a problem is
> it? Are we talking greater than or less than 100 ps of extra
> transition
> time delay? Are coupling coefficients increased by greater that 10%?
> I
> know.. I know.. What frequency, what drive, etc. etc.. Do you have a
> handle on how big a problem it is and when it is prudent to include
> such?
>
> Rich Mellitz, NCR
> >----------
> >From: Dr. Edward P. Sayre[SMTP:[email protected]]
> >Sent: Monday, September 08, 1997 7:27 PM
> >To: [email protected]
> >Cc: [email protected]
> >Subject: Re: [SI-LIST] : skin effect and transmission line
> simulators
> >
> >Funny you should mention this. This is exactly the problem in
> estimating
> >the footprint effects we have seen in BGA dispersion problems.
> Having the
> >package paramters is only half the problem. Who will provide the
> rest of
> >the circuit information for packaging?
> >
> >ed sayre
> >
> >At 11:20 AM 9/5/97 -0400, you wrote:
> >>
> >>
> >>On Thu, 4 Sep 1997, Al Barber wrote:
> >>
> >>> Chris Simon wrote:
> >>> >
> >>>
> >>> > The simulator I'm looking for should include all of the
> following:
> >>> ....
> >>> >
> >>> > I would be interested in hearing which of the above criteria are
> met by
> >>> > other tools, or whether a future revision will incorporate these
> >>>>features.
> >>>
> >>> There is an additional feature I'm surprised you don't mention.
> How
> >>> about crosstalk among multiple lines?
> >>>
> >>> Al Barber
> >>> Hewlett Packard Labs
> >>>
> >>
> >>Crosstalk not only appears between multiple parallel lines, but also
> >>between vias. Our recent study shows that electromagnetic coupling
> between
> >>vias is often as significant as or sometimes even more significant
> than
> >>the coupling between parallel traces. A signal integrity software
> tool is
> >>better to be able to accurately model the coupling between multiple
> lines,
> >>vias, as well as the voltage fluctuations in the power and ground
> supply
> >>systems.
> >>
> >>
> >>Jiayuan Fang
> >>SUNY-Binghamton
> >>
> >>
> >>
> >
> >
> >
> >+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
> >| NORTH EAST SYSTEMS ASSOCIATES, INC. |
> >| ------------------------------------- |
> >| "High Performance Engineering & Design" |
> >+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
> >| Dr. Ed Sayre e-mail: [email protected] |
> >| NESA, Inc. http://www.nesa.com/ |
> >| 636 Great Road Tel +1.508.897-8787 |
> >| Stow, MA 01775 USA Fax +1.508.897-5359 |
> >+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
> >
> >
> >
>