[SI-LIST] Re: IBIS modeling
- From: Scott McMorrow <scott@xxxxxxxxxxxxxxxx>
- To: chris.cheng@xxxxxxxxxxxx
- Date: Thu, 11 Oct 2001 17:18:09 -0700
Chris,
IBIS cannot handle state dependent preemphasis
or state dependent receiver termination. These can
only be simulated correctly with SPICE.
IBIS is useful only for "vanilla" flavored LVDS drivers
and receivers.
regards,
scott
Chris Cheng wrote:
> I am always curious about how can IBIS handle circuits
> like driver preemphasis or active state dependent
> receiver termination.
> Chris
>
> -----Original Message-----
> From: Jon Powell [mailto:jpowell@xxxxxxxxxxxx]
> Sent: Thursday, October 11, 2001 2:32 PM
> To: chris@xxxxxxxxxx; khalida@xxxxxxxxxxx
> Cc: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: IBIS modeling
>
> I have done some LVDS models and have NOT had any (good) luck
> in simulating them as single ended buffers.
> Let me re-phrase that. Most of the SPICE models that I have run do
> not give correct (or self-correlating) results if you don't put the
> series current return resistor into the LVDS circuit. If you try to
> simulate this resistor with a resistor to some constant node you also
> get bogus results. In order to get correct SPICE results you have to
> simulate
> both drivers at the same time with the correct termination.
>
> I have seen this result in 3 independent LVDS drivers from different
> vendors.
>
> For an example LVDS IBIS model, you might check out the National or Altera
> web pages.
>
> jon
>
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Chris Brewster
> > Sent: Thursday, October 11, 2001 10:32 AM
> > To: khalida@xxxxxxxxxxx
> > Cc: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: IBIS modeling
> >
> >
> > Khalid,
> >
> > Most of the information describes the process for extraction
> > of a Single
> > Ended buffer. With LVDS, you have to treat each output as if
> > it were a
> > single ended buffer and then combine them to create a
> > differential model.
> >
> > The literature from the IBIS summit by Hegazy is a good place
> > to start.
> >
> > http://www.eda.org/pub/ibis/summits/jan01/hegazy.zip
> >
> > regards,
> >
> > -Chris
> >
> >
> > At 09:01 AM 10/11/2001 -0700, Khalid Ansari wrote:
> >
> > >Hi all,
> > >
> > >I am looking to create IBIS models for my LVDS I/Os. I already
> > >have Hspice models created. Is there any good literature on how
> > >to create IBIS models out of Hspice models. I haven't had a chance
> > >to work with IBIS in the past so any introductory literature will be
> > >helpful. I guess the IBIS version I will be using is 3.2
> > with scripts
> > >created by North Carolina State University.
> > >
> > >Thanks in advance,
> > >Khalid
> > >
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--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR 97062-3090
(503) 885-1231
http://www.siqual.com
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