RE: [IBIS-Users] In V/T curves why does 50 points in .ibs Vs 100 in spice output

Subject: RE: [IBIS-Users] In V/T curves why does 50 points in .ibs Vs 100 in spice output
From: Ambrish Varma (akvarma@ncsu.edu)
Date: Thu Jul 24 2003 - 18:37:07 PDT

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Hi Jose,
You see this is because in s2ibis2, the default VT table length is
hard-coded to 50. This is set in the s2idflt.h in the /src folder and
was done so the table does not become too large and show redundant data
(as you can see).

If you want to change the size of the table, you need to open the
abovementioned file, change the 'WAVE_POINTS_DEFAULT' parameter to 101
and then recompile the source files.
Hope this helps.
-Ambrish Varma

Ambrish K Varma
akvarma@ncsu.edu
ph(919)513-2015
fax(919)515-2285

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Angulo, John
Sent: Wednesday, July 23, 2003 9:02 PM
To: 'ibis-users@eda.org'
Subject: [IBIS-Users] In V/T curves why does 50 points in .ibs Vs 100 in
spice output

The following is posted on behalf of Jose Corona at Artisan Components.
Please send all private replies to jcorona@artisan.com only.

-----Original Message-----

Hello,

Does anyone know why in the .ibs file generated by s2ibis2 the V/T
curves
only report 50 points, whereas in the spice output files there are 100
points?

Here is a sample of the spice output and the .ibs output:

SPICE(typ corner):

Index time v(opad)

------------------------------------------------------------------------
--------

0 0.0000000e+00 4.3253099e-01

1 5.0000000e-11 4.3253113e-01

2 1.0000000e-10 4.3252559e-01

3 1.5000000e-10 4.3252751e-01

4 2.0000000e-10 4.3253553e-01

5 2.5000000e-10 4.3253529e-01

6 3.0000000e-10 4.3253389e-01

7 3.5000000e-10 4.3253236e-01

8 4.0000000e-10 4.3253074e-01

9 4.5000000e-10 4.3252927e-01

10 5.0000000e-10 4.3253518e-01

11 5.5000000e-10 4.3256145e-01

12 6.0000000e-10 4.3260427e-01

13 6.5000000e-10 4.3261196e-01

14 7.0000000e-10 4.3256039e-01

15 7.5000000e-10 4.3247953e-01

16 8.0000000e-10 4.3242192e-01

17 8.5000000e-10 4.3246200e-01

18 9.0000000e-10 4.3256133e-01

19 9.5000000e-10 4.3278955e-01

20 1.0000000e-09 4.3323946e-01

IBIS:

[Rising Waveform]

R_fixture = 60.0000

V_fixture = 0.9000

| time V(typ) V(min) V(max)

0.000S 0.4325V 0.4109V 0.4434V

1.000e-10S 0.4325V 0.4109V 0.4433V

0.2000nS 0.4325V 0.4109V 0.4434V

0.3000nS 0.4325V 0.4109V 0.4434V

0.4000nS 0.4325V 0.4109V 0.4435V

0.5000nS 0.4325V 0.4109V 0.4433V

0.6000nS 0.4326V 0.4109V 0.4451V

0.7000nS 0.4326V 0.4109V 0.4476V

0.8000nS 0.4324V 0.4109V 0.6000V

0.9000nS 0.4325V 0.4109V 1.3244V

1.0000nS 0.4330V 0.4109V 1.5174V

I'll appreciate any input on this issue,
Thanks,

-Jose

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Next message: Bob Ross: "[IBIS-Users] BIRD74.5 EMI Parameters"
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In reply to: Angulo, John: "[IBIS-Users] In V/T curves why does 50 points in .ibs Vs 100 in spice output"
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