RE: [IBIS-Users]: DC voltage for C_comp Calculation

Surendra,
 
By *-AMS extensions of IBIS I am referring to the [External Model]
or [External Circuit] keywords which allow you to use VHDL-AMS,
Verilog-AMS, or Verilog-A and Berkeley SPICE for writing models.
 
Unfortunately not too many EDA vendors support these languages,
so you may need to look around first whether your tool can use
such models because you roll up your sleeves to write models like
that.
 
Arpad
====================================================================

________________________________

From: surendra.deshmukh@wipro.com [mailto:surendra.deshmukh@wipro.com]
Sent: Monday, October 11, 2010 12:04 AM
To: Muranyi, Arpad; ibis-users@eda.org
Subject: RE: [IBIS-Users]: DC voltage for C_comp Calculation

Hi Arpad,

             Thanks for information. I have seen some of the tools use
vdd/2 as a DC value to calculate C_comp so as per your comments, I would
say it is not always good to use vdd/2.

             Can you elaborate what is *-AMS extensions of IBIS?

Regards

Surendra

________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Muranyi, Arpad
Sent: Friday, October 08, 2010 9:38 PM
To: ibis-users@eda.org
Subject: RE: [IBIS-Users]: DC voltage for C_comp Calculation

The problem is that you may get different results

depending on the DC bias. For that reason I usually

recommend to use a DC value that is close to where

the signaling will be, but you could still get

different results for the high and low levels.

This is when good engineering judgment comes handy,

or a more elaborate behavioral model perhaps using

the *-AMS extensions of IBIS...

Arpad

=====================================================

________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of surendra.deshmukh@wipro.com
Sent: Friday, October 08, 2010 8:24 AM
To: ibis-users@eda.org
Subject: [IBIS-Users]: DC voltage for C_comp Calculation

Hi,

       For the calculation of C_comp by AC sweep, we apply an AC signal
along with some DC voltage. What should be the value of this DC voltage
to get correct C_comp value?

Thanks in advance.

Regards

Surendra

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