eldo_user

Monte Carlo Analysis
Obsolete Features
.PARAM TOX=19E-09
.PARAM TOX_GLOB =TOX
LOT/GAUSS=2%
.SUBCKT N D G S B PARAM: W=1U L=1U
M1 D G S B MODN W=W L=L
.PARAM A_MM_TOX=0.4543U B_MM_TOX=0.1435
+ DEV_MM_TOX =’A_MM_TOX/SQRT(W*L)+B_MM_TOX’
.PARAM VTH0=.3322 A_MM_VTH0=0.40654U B_MM_VTH0=0.11654
+ DEV_MM_VTH0 =’A_MM_VTH0/SQRT(W*L)+B_MM_VTH0’
.PARAM U0=388.3203 A_MM_U0=0.565745U B_MM_U0=0.264563
+ DEV_MM_U0 =’A_MM_U0/SQRT(W*L)+B_MM_U0’
.MODEL MODN NMOS
+LEVEL=53
+TOX = TOX_GLOB DEV/GAUSS={DEV_MM_TOX}%
+VTH0 = VTH0 DEV/GAUSS={DEV_MM_VTH0}%
+U0 = U0 DEV/GAUSS={DEV_MM_U0}%
+KF=1E-27 AF=2
+TNOM=27.0
...
.ENDS
Outside the .SUBCKT block we created the parameter TOX_GLOB with explicit LOT
variations. This results in the generation of a random variable named P(TOX_GLOB). Finally
we will have 52 independent variables.
Related Topics
Statistical Variations
Obsolete Features
The features described here are related to sampling methods, not statistical models, and should
not be used.
LIMIT Distribution
The LIMIT distribution is a discrete probability distribution on finite set {L, U} which can be
characterized by saying that the values L and U are equally probable.
548
Eldo® User's Manual, 15.3