RE: [IBIS-Users] C_Comp

Lee,

The IBIS model's IV curve which determines its impedance
does not include any C_comp effects.  The Vt curves which
are used to turn on and off the IV curves do include the
C_comp effect in their shape, but they do not effect the
DC nature of the IV curves.  Therefore we do need to add
a capacitor to account for the capacitive nature of the
drivers (or receivers).  As stated in another response,
this is necessary for getting the correct reflections 
in the simulations when a wave hits the model.

Arpad Muranyi
Intel Corporation
------------------------------------------------------------

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of lee yang
Sent: Tuesday, March 01, 2005 8:58 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] C_Comp

Hi,
Since the C_Comp effect is already embedded in the Spice model, hence,
the generation of IBIS model automatically includes the effect of it. I
am wondering, since the C_Comp effect is already included in the IBIS
model, why do we still need to put it in the IBIS file? Why it is so
important?
Thanks a lot.
-Lee

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