RE: [IBIS-Users] C_Comp

From: Ambrish Varma <akvarma_at_.....> Date: Tue Mar 01 2005 - 21:28:51 PST · This archive was generated by hypermail 2.1.8 : Tue Mar 01 2005 - 21:30:37 PST

Hello Lee,
The C_Comp is used by the simulator to perform simulations. An easy case to
understand is the reflected wave coming into the driver. It sees the C_Comp,
which is the total capacitive load looking into the pad, and adjusts the
wave. An absent C_Comp will give you invalid results. 

If you are deriving your IBIS models from the spice model, you are expected
to have the C_Comp included in the waveforms of your IBIS models. The
simulator will take care of it.

Hope that helps.
Regards,

Ambrish K Varma
akvarma@ncsu.edu
North Carolina State University
ph(919)513-2015, fax(919)515-2285

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of lee yang
Sent: Tuesday, March 01, 2005 11:58 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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