Subject: Re: [IBIS-Users] Measurement deratings?
From: Duane Mattheisen (duane.mattheisen@onsemi.com)
Date: Thu May 29 2003 - 17:13:50 PDT
Hello All
All of my AC data tables are measured. But if I simulate an output
of an IBIS model with a 4pF load I get a jittery edge. Even after
putting more points in the data (20 to 50 points in the edge). I've
tried smoothing the wave form and taking out any over/under shoot but
the simulations still have a jittery edge. If I take out the AC data
table and leave in the DV/DT information the wave forms look fine. Is
there a fix to my problem? I work with CMOS logic devices.
Thanks Duane M
"Muranyi, Arpad" wrote:
>
> Tim,
>
> IBIS doesn't have to provide this derating construct in order
> for you to make an IBIS model with derating. You measure your
> data, import it into your favorite spreadsheet, and massage it.
> After that you can make your IBIS model with the massaged data.
>
> Arpad
> ===============================================================
>
> -----Original Message-----
> From: Timothy Coyle [mailto:timothy.coyle@sun.com]
> Sent: Wednesday, May 28, 2003 8:48 AM
> To: John Phillippe
> Cc: ibis-users@eda.org
> Subject: Re: [IBIS-Users] Measurement deratings?
>
> John Phillippe wrote:
> >
> > Hello,
> > I am wondering how people match their IBIS simulations to silicon
> > measurements. I read through the spec, and didn't see anything that
> > looked like a derating type construct. So it is my understanding that
> > when someone takes lab measurements of an I/O buffer, those data points
> > are directly inserted into the ibis file, replacing the simulated data.
> > Does this sound correct? Is there another way, to get simulations to
> > more closely match measurements?
> >
> > --
> > John Phillippe
> > SPS, 32 Bit Embedded Controller Division, IC Creation
> > Motorola - 512-895-1835
> > Austin, TX - john.phillippe@motorola.com
> >
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> Hi John,
> Not sure if you are talking about transmission line simulations or just the
> IBIS data itself, but here is my 2 cents. If your IBIS file was created from
> SPICE models, the real correlation should be between your SPICE simulations
> and real silicon. A good methodology might be to correlate your SPICE models
> to silicon, then translate your SPICE models to IBIS, and correlate your
> IBIS file to your SPICE model. If your SPICE models do not correlate well to
> silicon, you could extract IBIS data from
> the bench and insert into your IBIS file. This should make your IBIS file
> correlate better to silicon. It will be more difficult to get your min and
> max
> data from the lab than from simulation.
>
> Regards,
> Tim
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