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

Kiran,
 
Which simulator did you use when
you made this waveform?
 
Arpad
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________________________________

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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