Nick, it's not true that the IBIS spec demands monotonicity on models. If
you run one of the free IBIS model viewers available on a model with
non-monotonic curves, you will get warnings, not errors. I know of two SI
simulators which accept non-monotonic IBIS models. Non-monotonicity is a
reality in some devices, as I've learned in talking to engineers at
semiconductor vendors.
Regards,
Fabrizio Zanella
EMC corporation
fzanella@emc.com
-------------
Original Text
From: "Krull, Nick J" <KrullNJ@LOUISVILLE.STORTEK.COM>, on 11/10/98 11:29
AM:
To: smtp@Eng@EMCHOP1["'ibis-users@vhdl.org'" <ibis-users@vhdl.org>]
Has anybody run test cases against popular simulators to determine
how important/sensitive monotonicity is to:
1) Convergence
2) Accuracy
We are frequently running into models with non-monotomic features. The
simulator
vendors recommend that models be monotomic and I believe the IBIS
spec demands it. Screening these features out is time consuming and
testing the resultant model is even more time consuming. IBIS simulators
generally do not have the knobs that SPICE simulators do. Is there a
mathematical reason for this, or is it more a customer issue?
Anybody have a few pearls of wisdom on this? What is the history behind
it?
Nick Krull
StorageTek
11/10/98
Received on Tue Nov 10 09:09:03 1998
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