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Monte Carlo Analysis
Specifying Statistical Variations for Individual Model Parameters
This correlation structure is handled implicitly by the simulator. The transformation is
calculated during the simulation, and the sampling is generated in the space of the independent
variable X.
Related Topics
Specifying Statistical Variations for Individual Model Parameters
Input Sample
Specifying Statistical Variations for Individual
Model Parameters
Individual model parameters may have statistical variations. You can specify these using the
DEV and/or LOT parameters immediately following the model parameter in the .MODEL
statement.
For example, use the following syntax to define an NMOS model with VTO set to 0.6V and
TOX set to 1.5×10 −7 :
.MODEL N NMOS VTO=0.6 TOX=1.5e-7 DEV=1.0e-8
The model parameter TOX has a uniform distribution with σ = 1.0×10 -8 , but VTO has a
constant value. The following specification is equivalent:
.MODEL N NMOS VTO=0.6 TOX=1.5e-7 DEV=6.66%
To use a Gaussian distribution, change the DEV parameter to DEV/GAUSS. Using the same
example, changing the TOX distribution to Gaussian would modify the .MODEL card as
follows:
.MODEL N NMOS VTO=0.6 TOX=1.5e-7 DEV/GAUSS=1.0e-8
Tip
See “.MODEL” in the Eldo Reference Manual.
Related Topics
Statistical Variations on Binning Parameters
Assigning Statistical Variations using the .MCMOD Command
Eldo® User's Manual, 15.3 445