Re: [IBIS] IBIS Models performance on high speed systems

Subject: Re: [IBIS] IBIS Models performance on high speed systems
From: Robert Haller (rhaller@sisoft.com)
Date: Mon Nov 11 2002 - 05:33:13 PST

Shee Kian Wong,
        There is no inherent reason why an IBIS model can not accurately model
a buffer at high speed operation. We have effectively generated models
which duplicate spice models at > 1 Gps data rate.

In addition as I/O buffer speeds increase, it becomes more important to
design I/O drivers that are symmetrical and operate in the linear
region. This is IBIS's strength.

To make accurate IBIS models is hard work. You must have accurate spice
models, accurate package models,and generate an accurate C_comp. You
should be an experienced model developer.

What often limits the performance of any simulation is accurate
interconnect models. Generating high performance interconnect models can
be as challenging as modeling high performance I/O cells because of
faster edge rates, skin effect and dielectric losses.

regards,
Bob 

-- 
Robert J. Haller (rhaller@sisoft.com)
Principal Consultant
Signal Integrity Software Inc.
6 Clock Tower Place, Suite 250
Maynard, MA 01754
Phone: (978) 461-0449, ext 15

Shee Kian Wong wrote:
> Hi all,
> 
> I've got some questions regarding the performance of IBIS models in high 
> speed systems (>1Gbps data rate?).
> 
> I once read in an article saying that IBIS models are no longer reliable 
> at high speed operation. But isn't that an IBIS model that is generated 
> from SPICE simulation should reflect the behavior of the SPICE model? 
> What actually limits an IBIS model's performance in a high speed system?
> 
> Thanks & Regards,
>  
> */Shee Kian Wong/*//
> Applications Engineer
>  
> _____________________ 
> Altera Corporation (M) S/B
> Bayan Lepas Technoplex,
> Medan Bayan lepas,
> 11900 Penang, Malaysia.
>  
> Tel:  +604 636-6185
> Fax: +604 642-8525
> 

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