RE: [IBIS-Users] c_comp calculation

Shivani,

#1)  The V-t data in IBIS models includes the C_comp effects, this
is why C_comp shouldn’t be visible from the inside, because that
means that the V-t data is not loaded by C_comp to slow it down.
An IBIS simulator should reproduce the V-t data if you load the
buffer with the same V_fixtre and R_fixture load with which the
V-t data was generated, no matter what C_comp value you have.

#2)  You should use the frequency for obtaining C_comp which is
most representative of the buffer’s signal frequency.

I hope this helps,

Arpad
=====================================================================

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Shivani Sharma
Sent: Tuesday, November 11, 2014 4:57 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] c_comp calculation

Hi all

I have a few queries-

1. C-comp is invisible looking from inside but visible looking from outside of Tx driver model.  In IBIS, does V-t include c_comp effects?. During spectre sims, changing pad capacitance does change V-t data.

2. To calculate c_comp, how is most likely operating frequency of buffer decided.


thanks
Shivani

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