RE: [IBIS-Users] issue in VT extraction

From: <seshadri.kirankumar_at_.....>
Date: Tue Feb 07 2006 - 04:23:28 PST
Arpad , 



       I am not doing simulation on IBIS file but in the procedure to
generate IBIS model of VT data i.e Rising and Falling connecting to VSS
that means  the plot which you saw was spice3 simulation result done on
the spice netlist using 2 decks one for Rising and one for Falling. As I
don't have permissions to send this decks and inputs for generation of
IBIS I could not send across.



 Hope this clear your point spice3 does not have feature to simulate
IBIS model. 



Best Regards

Kiran Kumar



________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Muranyi, Arpad
Sent: Monday, February 06, 2006 10:00 PM
To: ibis-users@eda.org; ibis@eda.org
Subject: RE: [IBIS-Users] issue in VT extraction



Kiran,



I am not sure whether you answered my question

correctly.  I was wondering what simulator did

you use to simulate the IBIS model, not what

simulator you used to generate the Vt data

for the IBIS model.



Does spice3 have an IBIS buffer element?



Arpad

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



________________________________

From: seshadri.kirankumar@wipro.com
[mailto:seshadri.kirankumar@wipro.com]
Sent: Thursday, February 02, 2006 8:21 PM
To: Muranyi, Arpad; ibis-users@eda.org; ibis@eda.org
Subject: RE: [IBIS-Users] issue in VT extraction

Arpad,



         This data for plot is generated using spice3



Best Regards

Kiran Kumar



________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Muranyi, Arpad
Sent: Thursday, February 02, 2006 10:06 PM
To: ibis-users@eda.org; ibis@eda.org
Subject: RE: [IBIS-Users] issue in VT extraction



Kiran,



Which simulator did you use when

you made this waveform?



Arpad

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



________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of seshadri.kirankumar@wipro.com
Sent: Thursday, February 02, 2006 3:19 AM
To: ibis-users@eda.org; ibis@eda.org
Subject: [IBIS-Users] issue in VT extraction

Hi IBIS Experts,



    I have an query  in IBIS modeling about extracting VT data,

I am generating model for one buffer which is having its output swing
from +0.21V to -0.21V, But as you see in the Plot for

Rising (if the i/p pulse is Rising ) then it is giving proper switching
(Red coloured)

But in Falling (if the i/p pulse is falling) then for  1 st pulse it is
not going down and reaching to -0.21V even I tried giving very low
frequency i/p signal(Green coloured).



Here my doubt is why IBIS takes first 1/4 th of Pulseperiod of i/p
signal, is there any reason in that?



 If there is no any constraint on this  as I am seeing the good
performance in second pulse onwards I can do  a X-axis shift (Time
shift) of the second Falling Pulse.



I wanted this clarification because I am not aware of internal
architecture which causing this problem in the netlist(input) which I am
using for generation.



Thanks in Advance



Best Regards

Kiran Kumar




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Received on Tue Feb 7 04:23:47 2006

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