[SI-LIST] Re: ibis check output errors

  • From: Itzik Peleg <itzikpe@xxxxxxxxxxxxxx>
  • To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 11 Feb 2004 19:34:34 +0200

Hello
Check if your currents in the IV table are defined correctly according 
to IBIS convention.
Also check if your VT curve reach steady state levels.

Itzik

Alaa Alani wrote:

>Hi Guys,
>
>can anyone help explain why the ibis checker is reporting these huge
>differences between the I-V curves and V-t curves. I checked the transient
>response of the buffer and it looks good. Is it something to do with
>tolerance or range of voltage? 
>
>Any help would be greatly appreciated.
>
>Thanks,
>Alaa Alani
>
>here 's the ibis checker output:
>----------------------------------------------------------------------
>
>ERROR - Model driver: The [Rising Waveform] 
>      with [R_fixture]=500 Ohms and [V_fixture]=0V
>      has TYP column DC endpoints of  0.00V and  0.85v, but
>      an equivalent load applied to the model's I-V tables yields
>      different voltages (-1.20V and -1.10V),
>      a difference of 1200.01% and 1950.00%, respectively.
>ERROR - Model driver: The [Falling Waveform] 
>      with [R_fixture]=500 Ohms and [V_fixture]=1.2V
>      has TYP column DC endpoints of  0.17V and  1.20v, but
>      an equivalent load applied to the model's I-V tables yields
>      different voltages (-1.20V and -1.10V),
>      a difference of 1370.00% and 2300.00%, respectively.
>ERROR - Model driver: The [Rising Waveform] 
>      with [R_fixture]=500 Ohms and [V_fixture_min]=0V
>      has MIN column DC endpoints of  0.00V and  0.66v, but
>      an equivalent load applied to the model's I-V tables yields
>      different voltages (-1.20V and -1.22V),
>      a difference of 6000.07% and 9400.00%, respectively.
>ERROR - Model driver: The [Falling Waveform] 
>      with [R_fixture]=500 Ohms and [V_fixture_min]=1.2V
>      has MIN column DC endpoints of  0.29V and  1.11v, but
>      an equivalent load applied to the model's I-V tables yields
>      different voltages (-1.20V and -1.22V),
>      a difference of 7450.00% and 11650.00%, respectively.
>ERROR - Model driver: The [Rising Waveform] 
>      with [R_fixture]=500 Ohms and [V_fixture_max]=0V
>      has MAX column DC endpoints of  0.00V and  1.01v, but
>      an equivalent load applied to the model's I-V tables yields
>      different voltages (-1.20V and -0.98V),
>      a difference of 545.46% and 904.55%, respectively.
>ERROR - Model driver: The [Falling Waveform] 
>      with [R_fixture]=500 Ohms and [V_fixture_max]=1.2V
>      has MAX column DC endpoints of  0.13V and  1.30v, but
>      an equivalent load applied to the model's I-V tables yields
>      different voltages (-1.20V and -0.98V),
>      a difference of 604.55% and 1036.36%, respectively.PowerVR
>Imagination Technologies Ltd.
>
>----------------------------------------------------------------------
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