[SI-LIST] Re: SPICE or IBIS
- From: "Clewell, Craig" <cclewell@xxxxxxxxxxxxxx>
- To: "'emc_gibney@xxxxxxxxxxx'" <emc_gibney@xxxxxxxxxxx>
- Date: Wed, 3 Dec 2003 13:45:01 -0500
Eoin,
Your back <grin>. How are things going for you?
You are correct that you can use one of the latest and greatest software
methods to extract a model from measurements. However, if you do so you
will also include the effects of your test set up, unless you devise a way
to remove them from the measurement, or perform some type of de-embedding
after your measurements. The alternative is to create a model from a field
solver, or any of the other proven methods. This may be something to keep
in mind when making your choice.
There are some new pieces of software that will allow you to de-embed your
DUT from the measurements and there are others out there that do not. Some
also have a limitation on the number of ports that you can generate in the
model. This is something else you may want to consider as you embark on
your modeling Journey (they were a good band weren't they).
I believe both methods are capable of including losses, and both methods are
capable of generating a model that will work at high frequencies (this is a
relative term).
Curious...when I think of IBIS I think about IP that you don't want to give
away. I'm not sure why this would be an issue when modeling connectors
since it is impossible to reverse engineer the connector from the SPICE
file. It seems that the availability of SPICE related software is much more
plentiful. In fact, there are a few tools out there that allow you to
incorporate both types of models in one simulation.
Regards,
Craig Clewell
-----Original Message-----
From: package_char [mailto:emc_gibney@xxxxxxxxxxx]
Sent: Wednesday, December 03, 2003 5:02 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] SPICE or IBIS
Experts,
I have been researching some methods to model packages and connectors
and from what I have seen a common method is to extract a coupled
lumped/distributed SPICE model from VNA or TDR/T measurements. These
SPICE models can be used to model performance at high
speed/frequencies. My question is if I was to create an IBIS model as
oppposed to a SPICE model is there any limitations, for example?
a) the highest frequency/shortest rise time possible
b) how does it handle losses etc
As I understand there is software to convert a SPICE model to IBIS
format, would this be the best way to go or directly create an IBIS
model from measurements?
Regards,
Eoin Mc Gibney
CIT
emcgibney@xxxxxx
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