RE: [SI-LIST] : Ibis models

Geoff Parker (geoff@viewlogic.com)
Thu, 30 Sep 1999 12:10:32 -0700 (PDT)

Ok I agree with you here: Well behaved != correct.

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 gparker@viewlogic.com
# 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.
>
>
>
> **** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****
>
>

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****