[SI-LIST] Re: IBIS Model Quality (or lack thereof)
- From: "Todd Westerhoff" <twester@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 25 Mar 2002 18:28:08 -0500
Oh no, here we go ...
For the record, we've had *VERY* good luck getting HSpice to correlate with
IBIS simulations - the problem is, we've had to create most of the IBIS
models ourselves ir order to get things to match.
Please, let's save the "ultimate HSpice accuracy" arguments for another
thread (preferably one that gets redirected to /dev/null). I'm well aware
of IBIS' limitations, and we've done lots of real-world comparisons for our
current applications. IBIS will work just fine if we have decent models ...
AND, I'll be able to do all the post-route analysis I want.
The question remains, folks ... what semiconductor vendors are willing to
"step up the plate" and tell us how they test their IBIS models to ensure
correlation to a known source (measurement or HSpice)?
Inquiring minds want to know!
Todd ;-)
Todd Westerhoff
Signal Integrity Engineer
Hammerhead Networks
5 Federal Street - Billerica, MA - 01821
email:twester@xxxxxxxxxxx - ph: 978-671-5084
============================================
"I’m starting With the man in the mirror
I’m asking him to change his ways
And no message could have been any clearer
If you wanna make the world a better place
Take a look at yourself, and then make a change"
- "Man in the Mirror", Michael Jackson
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Chris Cheng
Sent: Monday, March 25, 2002 5:18 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: IBIS Model Quality (or lack thereof)
Why use IBIS at all ?
If you are convinced that IBIS is not good enough (which I am), don't
simulate and just follow whatever the vendors design rules say. After =
all,
if you deviate from the rules based on your incorrect IBIS models, do =
you
think the vendor will really take responsibility if it doesn't work ? =
If you
follow the design rules, what value does the simulation add to you =
design ?
If you are serious enough to simulate, you must be working on something =
that
is unique about your own system that needs to be custom optimized =
beyond
what the component guideline can tell you. Get the SPICE model and do a =
good
job of modeling your own system. If a small little start up like mine =
can
get SPICE model from vendors, anyone can. Its just a matter of a few =
NDA and
extra effort.
-----Original Message-----
From: Todd Westerhoff [mailto:twester@xxxxxxxxxxx]
Sent: Monday, March 25, 2002 12:59 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] IBIS Model Quality (or lack thereof)
Hi all,
We have been doing a lot of comparisons between IBIS and HSpice models
lately, with a lot of less-than-satisfactory results.
I have an open question for the semiconductor suppliers among us:
What testing is performed after an IBIS model is created, to ensure =
that the
completed model behaves as expected? I'm interested in responses from
vendors that actually SIMULATE the IBIS model before distributing it =
for
customer use. It looks to me as though many of the models I've =
received
were never used in a simulation before being released ... and, as a
potential customer, I find that quite disheartening.
So the question is - what processes are being used to test IBIS models =
and
ensure they function properly before their release to customers?
As always, replies both on and off the list are greatly appreciated.
Todd.
Todd Westerhoff
Signal Integrity Engineer
Hammerhead Networks
5 Federal Street - Billerica, MA - 01821
email:twester@xxxxxxxxxxx - ph: 978-671-5084
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
"I=92m starting With the man in the mirror
I=92m asking him to change his ways
And no message could have been any clearer
If you wanna make the world a better place
Take a look at yourself, and then make a change"
- "Man in the Mirror", Michael Jackson
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