How to correct the monotonicity problem of ibis model when importing model to ICX?

Hello!

I tried to import an ibis model to ICX. It reports following errors of non
monononicity:

Error: The sum of the typical clamp curves is not monotonic at voltage 1.6
Error: The sum of the minimum clamp curves is not monotonic at voltage 2.1
Error: The sum of the maximum clamp curves is not monotonic at voltage 2.6

!! the model in question is in the end of this message !!

What is the best way to modify this model to make it compatible with ICX? Does
simulation distort significantly if I just change all the I-values to zeros
after voltage has turned positive?

Second question:

What is the good (best) way to define Vmeas value if it isn't included in the
model and can't be found from the datasheets, etc. (maybe Vdd*0.5?)?

********************************************************

[Model] ptic
Model_type Input
Polarity Non-Inverting
Enable Active-Low
Vinl = 0.8000V
Vinh = 2.000V
C_comp 5.0pF 5.0pF 5.0pF

[Temperature Range] 25.0000 85.000 -40.0000
[Voltage Range] 3.3000V 2.9700V 3.6300V
[GND_clamp]
| voltage I(typ) I(min) I(max)

-3.30 -0.761 -0.682 -0.999
-3.20 -0.712 -0.641 -0.928
-3.10 -0.664 -0.601 -0.859
-3.00 -0.618 -0.563 -0.794
-2.90 -0.574 -0.526 -0.731
-2.80 -0.531 -0.49 -0.67
-2.70 -0.49 -0.455 -0.612
-2.60 -0.451 -0.421 -0.557
-2.50 -0.413 -0.388 -0.504
-2.40 -0.376 -0.357 -0.454
-2.30 -0.342 -0.327 -0.407
-2.20 -0.308 -0.298 -0.362
-2.10 -0.277 -0.27 -0.319
-2.00 -0.247 -0.244 -0.28
-1.90 -0.219 -0.219 -0.243
-1.80 -0.188 -0.191 -0.208
-1.70 -0.166 -0.171 -0.172
-1.60 -0.145 -0.151 -0.147
-1.50 -0.124 -0.131 -0.123
-1.40 -0.104 -0.112 -0.101
-1.30 -0.0847 -0.0933 -0.0784
-1.20 -0.0659 -0.0751 -0.0576
-1.10 -0.0483 -0.0579 -0.0387
-1.00 -0.032 -0.0416 -0.0221
-0.90 -0.018 -0.027 -0.0099
-0.80 -0.0079 -0.0147 -0.00469
-0.70 -0.00311 -0.00627 -0.00265
-0.60 -0.00144 -0.00228 -0.00121
-0.50 -0.000504 -0.000854 -0.000315
-0.40 -7.55e-05 -0.000237 -2.37e-05
-0.30 -2.96e-06 -2.93e-05 -3.18e-07
-0.20 -8e-08 -1.65e-06 -1.28e-08
-0.10 -6e-09 -7.53e-08 -1.75e-09
0.00 -4e-09 -7.75e-09 3.25e-09
0.10 -1e-09 -2.5e-09 9.25e-09
0.20 -2e-09 2.5e-10 1.43e-08
0.30 -2.5e-09 -2.5e-10 1.57e-08
0.40 -4e-09 -7.5e-10 1.98e-08
0.50 -2.5e-09 -1e-09 2.2e-08
0.60 -2e-09 5e-10 2.7e-08
0.70 -3e-09 1e-09 3.12e-08
0.80 -1e-09 -1.5e-09 3.5e-08
0.90 -3e-09 -5e-10 3.98e-08
1.00 -2e-09 -7.5e-10 4.22e-08
1.10 -2e-09 -3.5e-09 4.5e-08
1.20 0 -1.96e-07 4.93e-08
1.30 -5e-09 -5.23e-06 5.1e-08
1.40 -2.99e-07 -1.05e-05 5.15e-08
1.50 -1.64e-05 -1.35e-05 -3.01e-06
1.60 -2.03e-05 -1.4e-05 -1.49e-05
1.70 -2.12e-05 -1.39e-05 -2.99e-05
1.80 -2.15e-05 -1.32e-05 -3.21e-05
1.90 -2.1e-05 -2.32e-05 -3.26e-05
2.00 -2.02e-05 -3.13e-05 -3.24e-05
2.10 -2e-05 -0.000108 -3.18e-05
2.20 -2e-05 -0.000168 -3.05e-05
2.30 -2e-05 -0.000152 -5.53e-05
2.40 -2e-05 -5.97e-05 -7.74e-05
2.50 -2e-05 -1.16e-05 -0.000134
2.60 -2e-05 -1.37e-06 -0.000245
2.70 -2e-05 -1.32e-07 -0.000562
2.80 -1.84e-06 -1.1e-08 -0.00048
2.90 -1.17e-07 1.25e-09 -0.000223
3.00 -1e-08 1.25e-09 -6.41e-05
3.10 -5.5e-09 2.5e-09 -9.3e-06
3.20 -1e-09 5e-09 -5.43e-07
3.30 -2e-09 1.05e-08 8.95e-08

[POWER_clamp]
| voltage I(typ) I(min) I(max)

-3.30 0.388 0.281 0.525
-3.20 0.365 0.264 0.494
-3.10 0.343 0.248 0.464
-3.00 0.321 0.232 0.434
-2.90 0.3 0.216 0.406
-2.80 0.28 0.2 0.378
-2.70 0.26 0.186 0.352
-2.60 0.241 0.169 0.326
-2.50 0.222 0.156 0.301
-2.40 0.204 0.144 0.277
-2.30 0.187 0.131 0.254
-2.20 0.168 0.119 0.233
-2.10 0.154 0.107 0.212
-2.00 0.14 0.0948 0.192
-1.90 0.127 0.0828 0.169
-1.80 0.113 0.071 0.153
-1.70 0.101 0.0595 0.138
-1.60 0.0876 0.0484 0.122
-1.50 0.0748 0.0377 0.107
-1.40 0.0625 0.0279 0.0935
-1.30 0.0507 0.019 0.0796
-1.20 0.0396 0.0116 0.0665
-1.10 0.0295 0.00559 0.0543
-1.00 0.0205 0.00106 0.0428
-0.90 0.0127 0.000111 0.0321
-0.80 0.00535 8.34e-06 0.0219
-0.70 0.000761 7.24e-07 0.013
-0.60 4.39e-05 1.12e-07 0.00507
-0.50 1.37e-06 2.93e-08 0.000549
-0.40 4.5e-08 1.05e-08 2.08e-05
-0.30 0 5e-09 4.82e-07
-0.20 -1e-09 2.5e-09 1.48e-07
-0.10 -2.5e-09 1.25e-09 1.34e-07
 0.00 -2e-09 1.25e-09 1.29e-07
Received on Wed May 10 04:01:54 2000