[SI-LIST] Re: ibis limitations
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: kalgudo@xxxxxxxxx
- Date: Fri, 26 Jul 2002 16:05:12 -0700
Kal,
An IBIS model will model a the driver characteristics of a 3 gig
differential pair driver, if that driver is modeled well by the model
supplier, if that driver does not have preemphesis, and if that model
does not have a package.
IBIS cannot currently handle drivers with preemphesis and is very poor
at modeling packages. You will have significant divergence from reality
if you use an IBIS package model in a 3 gig differential simulation.
The solutions is generally to use Spice to model your 3 Gig devices.
Regards,
Scott
--
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
kal ansari wrote:
>Hi all,
>
>I would like to get some opinions from you guys on the limitation with IBIS
>models
>
>in regards to signal bandwidth. If I have a driver running around 3 Gbps with
>a rise time
>
>around 70 ps, will an IBIS model for this make sense? What is the current
>highest frequeny
>
>that IBIS accurately supports. A lot of the EDA tools run with just IBIS, if
>IBIS models
>
>are not accurate at these speeds, what is the solution?
>
>Thanks,
>
>gudo
>
>
>
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