[SI-LIST] Re: ibis limitations


Well said Scott. And no one would probably image this come from Chris' mouth
but even HSPICE seems to have significant problem modeling advanced
packaging and long lossy interconnect with dielectric loss. A more advanced
simulator like Agilent ADS seems to do the job better.
Chris

 -----Original Message-----
From:   Scott McMorrow [mailto:scott@xxxxxxxxxxxxx] 
Sent:   Friday, July 26, 2002 4:05 PM
To:     kalgudo@xxxxxxxxx
Cc:     si-list@xxxxxxxxxxxxx
Subject:        [SI-LIST] Re: ibis limitations


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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