RE: [IBIS-Users] problem with the rising and falling waveforms

Hi, Vivek,

Two items:
1) The V-t curves should have "zero slope" at both ends.
2) There I-V tables need a small enough step size so the linear
interpolation is accurate where the load line crosses.
Either (or both) of those could cause the parser report that you are seeing.
Drawing a load line on the I-V table can help identify the problem.

Another thought: Is 100 Ohms the usual transmission line impedance for
designs using this device?  Is this same resistance used for the [Ramp]
section?

Best regards,
Lynne


"IBIS training when you need it, where you need it."

Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@mindspring.com


-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Vivek Kumar Sundriyal
Sent: Friday, May 20, 2005 3:22 AM
To: ibis-users@eda.org; owner-ibis-users@eda.org
Subject: [IBIS-Users] problem with the rising and falling waveforms


Hi  ,

On running the IBISCHK4 on a generated IBIS model, I get the following error
:

ERROR - Model K3B07LG24Q7_QQ60: The [Rising Waveform]
      with [R_fixture]=100 Ohms and [V_fixture_max]=0V
      has MAX column DC endpoints of  0.00V and  3.46v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.00V and  4.23V),
      a difference of  0.03% and 18.33%, respectively.
ERROR - Model K3B07LG24Q7_QQ60: The [Rising Waveform]
      with [R_fixture]=100 Ohms and [V_fixture_max]=3.6V
      has MAX column DC endpoints of  0.11V and  3.60v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 0.11V and  4.40V),
      a difference of  0.04% and 18.69%, respectively.


Can anyone guide me on the cause of this error ? And how can I get over with
it ?

Thanks ,

Vivek



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