User`s guide

13
-
4 Monte Carlo and Sensitivity/Worst-Case Analyses
Waveform Reports
For Monte Carlo analyses, there are four variations of the output
which can be specified in the Output section of the Monte Carlo
or Worst Case dialog. These options are:
The * indicates that you can specify runs in the Value text box.
Values for the output variables specified in the selected analyses
are saved to the simulation output file and Probe data file. Note
that even a modest number of runs can produce large output
files.
Collatin
g
Functions
You may want to compress the results of Monte Carlo and
worst-case analyses further. Using the collating function
specified in the Function section of the Monte Carlo or Worst
Case dialog box, each run can be represented by a single
number. A table of deviations per run is reported in the
simulation output file.
Collating functions are listed in Table 13-1
.
All forces all output to be generated (including
nominal run)
First* generates output only during the first n runs
Every* generates output for every nth run
Runs* does specified analysis and generates
outputs only for the listed runs (up to 25
values can be specified in the list)
Table 13-1
Collating Functions Used in Statistical Analyses
Function Description
YMAX find the greatest difference in each waveform
from the nominal
MAX find the maximum value of each waveform
In excess of about 10 runs, the
Probe display tends to become
more of a band than a set of
individual waveforms. This can
be useful for seein
g
the typical
spread for a particular output
variable. As the number of runs
becomes lar
g
er, the spread
more closely approximates the
actual worst-case limits for the
circuit.