Re: [IBIS-Users] way to extract rising and falling waveform in differential cells

Hello Tom,

Is spice to IBIS tool calculate the waveform data for differential cell
also, means cell have just a swing of 300mv, because till date I am not
able to see IBIS model of a differential cell that have limted swing
with waveform information.

With Best regards
Akhilesh

Tom Dagostino wrote:

>Akhilesh
>
>A ramp based model simulation will start its transition immediately, there
>is no time delay built into the model. A SPICE simulation will include the
>delay of the buffer and other effects you are seeing in the SPICE output.
>If you want the two to match you need to include the full waveform models in
>the IBIS model. These waveforms need to be extracted preserving the time
>delay of the buffer. Using the SPICE to IBIS tools available on the IBIS
>web page should give you the results you want.
>
>If you need assistance in using this we can help.
>
>Tom Dagostino
>Teraspeed Consulting Group LLC
>503-430-1065
>tom@teraspeed.com
>www.teraspeed.com
>
>-----Original Message-----
>From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
>Behalf Of Akhilesh CHANDRA
>Sent: Tuesday, December 14, 2004 5:48 AM
>To: ibis-users@eda.org
>Cc: Akhilesh CHANDRA
>Subject: [IBIS-Users] way to extract rising and falling waveform in
>differential cells
>
>
>Hello Friends,
>
> I am devloping IBIS model of a differential cell having swing 300mv.
>when I run simulation at 300mhz then I find out there is a transition
>shift between IBIS and spice result. In my model I give just ramp
>database dv/dt for transition. In my view this problem may be resolve if
>I give complete rising and falling waveform in my models.
> Is anyone know how we can extract rising and falling waveform for a
>cell that have differential swing or any other way to reduce this shift.
>
> My results are attached with the mail.
>
>regards
>Akhilesh
>
>
>
>
>
>

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Received on Wed Dec 15 08:13:46 2004