User Guide

Analyses you can run with PSpice
7
Monte Carlo and sensitivity/worst-case
Monte Carlo and sensitivity/worst-case analyses are
statistical. PSpice changes device model parameter values
with respect to device and lot tolerances that you specify,
and runs a simulation for each value.
Table 5
summarizes how PSpice runs each statistical
analysis type.
Table 5 Statistical analysis types
For this statistical
analysis... PSpice does this...
Monte Carlo For each simulation,
randomly
varies all
device model parameters for which you
have defined a tolerance.
Sensitivity/
worst-case
Computes the probable worst-case
response of the circuit in two steps:
1
Computes component sensitivity to
changes in the device model
parameters. This means PSpice
nonrandomly
varies device model
parameters for which you have
defined a tolerance, one at a time for
each device and runs a simulation
with each change.
2
Sets
all
model parameters for
all
devices to their worst-case values
(assumed to be at one of the
tolerance limits) and runs a final
simulation.
Pspug.book Page 7 Wednesday, November 11, 1998 1:14 PM