[IBIS] RE: [IBIS-Users] issue in VT extraction

From: Muranyi, Arpad <arpad.muranyi_at_.....>
Date: Mon Feb 06 2006 - 08:29:50 PST
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 Mon Feb 6 08:30:21 2006

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