eldo_user

Monte Carlo Analysis
Further Examples
Each instance of a transistor using the NMOS model will have the same value of VTO
because NVTO affects a model parameter, and therefore LOT variation is used.
• The following is an example of statistical configuration usage:
.MODEL R RES TC1=2 LOT=5% DEV=10%
.SUBCKT R A B
R1 A B 1K
.ENDS
I1 1 0 PWL (0 1 10N 10)
X1 1 2 R STATISTICAL=0
X2 2 3 R
X2 3 0 R
.TRAN 1N 10N
.EXTRACT DC V(1)
.TEMP 10
.MC 1000
.END
Here, X1.R1 will remain at its nominal value during Monte Carlo analysis. This is
because STATISTICAL is set to 0 for X1.
.MODEL R RES TC1=2 LOT=5% DEV=10%
.SUBCKT R A B
R1 A B R 1K
.ENDS
I1 1 0 PWL (0 1 10N 10)
X1 1 2 R
X2 2 3 R STATISTICAL=1
X3 3 0 R
.TRAN 1N 10N
.EXTRACT DC V(1)
.TEMP 10
.MC 1000
.OPTION STATISTICAL=0 !Consider all the devices non-statistical by
default
.END
Here, only X2.R1 will vary during Monte Carlo analysis. This is because the global
STATISTICAL option is set to 0, meaning that devices are considered non-statistical by
default, but this is overridden by the STATISTICAL keyword, which is set to 1 for X2.
• The following is an example of using ICARLO in an extract:
Eldo® User's Manual, 15.3 535