BSIM3v3 PMOS model Pdiblc1 is negative?

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Jing

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recommended range for bsim3v3

I have another warning in the output log.

"M1: 'Pdiblc1' = -186.723e-03 is negative"

M1 is a pmos. I checked the model file of pmos. Pdiblc1 is indeed set to such a number. The mos model is BSIM3v3. So Pdiblc1 is negative, is it normal?
 

pmos model

Jing said:
I have another warning in the output log.

"M1: 'Pdiblc1' = -186.723e-03 is negative"

M1 is a pmos. I checked the model file of pmos. Pdiblc1 is indeed set to such a number. The mos model is BSIM3v3. So Pdiblc1 is negative, is it normal?
Click to expand...

The definition for Pdiblc1 is "first output resistance DIBL effect correction parameter" and the default value is 0.39- u can refer to bsim3v3 manual appendix.
In order to develop a model, we tweak our model to match measured data. A lot of parameter that need to be tweaked to match measured data. Sometimes the value of the parameter will fall outside the parameter range. It is very much depend on modeling guy who develop the model. I am not sure why your model has -ve value for Pdiblc1. Pdiblc1 is not a critical parameter. We only do a minor tweaking on this parameter. You should ask your foundry. I think they are using binning model.
 

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