RE: [SI-LIST] : IBIS model (Package parasitics)

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From: LEE,HENRY (A-SanJose,ex1) (henry_lee2@agilent.com)
Date: Tue Dec 19 2000 - 09:11:20 PST


Stephen,

that is exactly what I mean. So what you are saying is that, if
I include the parasitics only while the IBIS model is built, there will
be a big difference compared to if I exclude it during model build and
include it in the IBIS model file (as R_pkg, etc). I expected this
difference in the model files but what I really wanted to ask was when
I use these 2 models in an analysis tool like XTK, will I see any
difference.?
After all, for a user of the IBIS models, this is what matters.

I take it from the other respondents that the answer is no, there is no
difference. If this is the case, then we could use either method to handle
the parasitics of the package.
 

 

> -----Original Message-----
> From: Peters, Stephen [mailto:stephen.peters@intel.com]
> Sent: Friday, December 15, 2000 4:14 PM
> To: 'henry_lee2@agilent.com'; si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : IBIS model (Package parasitics)
>
>
>
> Hi Henry:
>
> If you are referring to the simulations used to extract
> data to build a
> model, then including the package makes a BIG difference, at
> least in the
> case of V-T tables. The V-T waveform tables are intended to
> capture the
> switching and overlap characteristics of the pull-up and pull-down
> transistors such that the simulator can extract the pertinent
> characteristics of the CMOS transistors themselves. If you
> add in the dV/dt
> and dI/dt effects of capacitance and inductance then all bets
> are off -- it
> is very difficult (if not impossible) to de-imbed the
> transistor switching
> data. Therefore, you should always take the [Ramp] and waveform data
> without the effects of packaging included.
>
> Regards,
> Stephen Peters
> Intel Corp.
>
> -----Original Message-----
> From: henry_lee2@agilent.com [mailto:henry_lee2@agilent.com]
> Sent: Friday, December 15, 2000 3:24 PM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : IBIS model (Package parasitics)
>
>
> Hi
>
> In regard to IBIS models, it seems the recommendation is to remove the
> parasitics of the package during simulation and include it in the
> model file itself. I supposed an alternative would be to leave
> it in during simulation and set the parasitics as zero in the
> model file. Can someone please clarify the differences, if any,
> between these two methods. Thanks in advance
>
> -Henry Lee
>
>
>
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