[IBIS] problem from spectre to IBIS model

Dear Experts,
 
I'm using Spectre simulator to generate IBIS model, 
but at the I/V  curve simulation, there are a lot of  warnings, and the 
simulation result is much different from Hspice simulation result.  Such 
as:
 
WARNING (CMI-2139): xgnd_clamp.x_pad_io.xmxidrv2/mpout@39: 
The bulk-source junction current exceeds `imelt'.  The results computed by 
Virtuoso(R) Spectre(R) are now incorrect because the junction current model has 
been linearized.
 
These happen for gnd clamp, power clamp, 
pulldown and pullup simulation, the voltage sweep is -VDD ~ 2VDD, when the 
voltage is too low, the simulation results (include ESD circuit) seems not 
correct. for example: i_gnd_clamp=40A, the current is bigger, and the Hspice simulation result is about 20A.

 
Could you tell me how can I do 
that?
 
Thanks a lot!!
 
bi  


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