435
Compact Model Library for Circuit Simulation
selecting appropriate switches or flags. The different flags are described in
the header section of the model card. The model card can be set up for corner
simulation by turning off all the flags for MC simulation. Different flags used
for MC simulation and their functions are summarized in Table 12.3. Some of
the parameters are repeated in the following section (Figure 12.5).
globaln/psigma
globaln/pmeansigma
globaln/pmean
FIGURE 12.5
The parameters of the systematic and random Gaussian distribution functions used in generating the compact model card using HSPICE circuit CAD.
TABLE 12.3
Definition of Different Parameters and Their Functions as Used in the Model Card
Parameter
Description
globalnmean
Sets the mean of the systematic variation agauss for NMOS in MC
simulation; e.g., globalnmean = 2 for a mean of 2-sigma (default = 0)
globalpmean
Sets the mean of the systematic variation agauss for PMOS in MC
simulation; e.g., globalpmean = 2 for a mean of 2-sigma (default = 0)
globalnsigma
Sets the width of the local systematic variation agauss for NMOS
(default: 1)
globalpsigma
Sets the width of the local systematic variation agauss for PMOS
(default: 1)
globalnmeansigma
Sets the spread of the distribution of die means for NMOS in total
MC variation (default: 2.8284) (die-to-die)
globalpmeansigma
Sets the spread of the distribution of die means for PMOS in total
MC variation (default: 2.8284) (die-to-die)
globalsigmavtflag = 1
Adds a fixed 1-sigma VTH variation offset to a fixed systematic
corner (default)
globalmismatchflag = 1 Enables mismatch (random variation) in MC simulations
globalmismatchnsigma
Set the width of the mismatch agauss (random variation) for NMOS
(default: 3)
globalmismatchpsigma
Set the width of the mismatch agauss (random variation) for PMOS
(default: 3)
mismatchflag = 1
Enables mismatch per device (instance parameter)
sigmavt
Sets the point on the distribution for VTH for a fixed corner per
device (instance parameter); this includes ONLY RDD and LER
Compact Model Library for Circuit Simulation
selecting appropriate switches or flags. The different flags are described in
the header section of the model card. The model card can be set up for corner
simulation by turning off all the flags for MC simulation. Different flags used
for MC simulation and their functions are summarized in Table 12.3. Some of
the parameters are repeated in the following section (Figure 12.5).
globaln/psigma
globaln/pmeansigma
globaln/pmean
FIGURE 12.5
The parameters of the systematic and random Gaussian distribution functions used in generating the compact model card using HSPICE circuit CAD.
TABLE 12.3
Definition of Different Parameters and Their Functions as Used in the Model Card
Parameter
Description
globalnmean
Sets the mean of the systematic variation agauss for NMOS in MC
simulation; e.g., globalnmean = 2 for a mean of 2-sigma (default = 0)
globalpmean
Sets the mean of the systematic variation agauss for PMOS in MC
simulation; e.g., globalpmean = 2 for a mean of 2-sigma (default = 0)
globalnsigma
Sets the width of the local systematic variation agauss for NMOS
(default: 1)
globalpsigma
Sets the width of the local systematic variation agauss for PMOS
(default: 1)
globalnmeansigma
Sets the spread of the distribution of die means for NMOS in total
MC variation (default: 2.8284) (die-to-die)
globalpmeansigma
Sets the spread of the distribution of die means for PMOS in total
MC variation (default: 2.8284) (die-to-die)
globalsigmavtflag = 1
Adds a fixed 1-sigma VTH variation offset to a fixed systematic
corner (default)
globalmismatchflag = 1 Enables mismatch (random variation) in MC simulations
globalmismatchnsigma
Set the width of the mismatch agauss (random variation) for NMOS
(default: 3)
globalmismatchpsigma
Set the width of the mismatch agauss (random variation) for PMOS
(default: 3)
mismatchflag = 1
Enables mismatch per device (instance parameter)
sigmavt
Sets the point on the distribution for VTH for a fixed corner per
device (instance parameter); this includes ONLY RDD and LER