What I meant by "Well behaved" (my own term not Viewlogic's or Ibis') was
a static, time-invariant, monotonic I-V curve which represents a single
transistor or diode stage. When a I-V curve has a non-monotonic region
due to a bus-hold circuit, it implies a dynamic state transistion. An I-V
curve should not contain any time-variant information.
In such a case I would break the stage into two parts, the primary I/O,
and the Bus Hold stage, and model each separately (with monotonic I-V
curves, V-T curves, etc.). Ibis supports this using Submodels.
#---------------------------------------------------------------
# Geoff Parker [email protected]
# Software Engineer 805 988-8250
# Viewlogic Systems 1369 Del Norte Rd.
# Signal Integrity Group Camarillo, CA 93010
On Thu, 30 Sep 1999, Ingraham, Andrew wrote:
> >Although the Ibis standard does not require monotonicity for the I-V
> >curves, the sum of the Ibis curves shown above should be mononotic for a
> >"well behaved" Ibis model (read correct).
>
> "Well behaved" does not necessarily translate to "correct".
>
> A device with "bus-hold" has a non-monotonic I-V curve.
>
>
>
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>
>
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