[SI-LIST] I-V vs V-T endpoints In IBIS
- From: "Timothy Coyle" <Timothy.Coyle@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 3 Jun 2002 12:56:51 -0400
Hello,
I am looking for some clarification on how the I-V and V-T data is used
from an IBIS file. When I make an IBIS file and run it through the
parser,
let's say I get a DC endpoint mismatch warning. I know that a load line is
applied to the I-V data and the enpoints of this are matched to the
endpoints
of the V-T data. I'm not sure of the importance of why these endpoints
should match. My understanding is that the I-V data is used to model the
endpoints
of the device, where the V-T data is used to model the low-to-high and
high-to-low transitions. I know that in HSPICE, when there is a mismatch,
the V-T
endpoint is modified to match the I-V endpoint. So how does this warning
affect the accuracy of the model? I'm thinking the V-T data plays a bigger
role than I think?
I've correlated SPICE to IBIS models with good results even with these
mismatches. And you can use the Ramp data and get the same result without
even using
the V-T data. I have a customer who is asking about this, and I want to
tell them that it's okay to have the warnings because of the above
reasons, but I'm
not entirely sure about that.
Thanks for any responses,
Tim
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