1 of 1 people found this helpful
Setting up a Monte Carlo Analysis
Use this procedure to set up a Monte Carlo analysis.
The Monte Carlo (MC) analysis gathers statistical data derived from estimates of the random
variability of all circuit components. MC analysis is used in conjunction with AC, DC and
• Schematic is open in simulation mode.
1. Select the instances or nets on the schematic to use for standard deviation reference.
2. Click the Setup Simulation icon on the Edit Toolbar, and then select the Monte
Carlo panel. The Setup Simulation Dialog Box (Monte Carlo Panel) displays.
3. Toggle the Monte Carlo Analysis to enable/disable it by clicking the Enable MC
Analysis checkbox. When enabled, the setup options for the Monte Carlo runs become
4. Define the random variables, simulation control options, and global setup for the
5. Click Apply. A .MC command is written to the simulation command file.
The Monte Carlo Distribution settings are ignored for Instances.
Options for the MC distribution settings include:
• Enabled — If this option is not checked, it indicates that a Monte
Carlo analysis need not be performed.
• LOT Distribution and DEV Distribution — Specify the type of
LOT and DEV Distributions by selecting from the dropdown list.
By default, this option is disabled for both the fields. If you select
Gaussian or Uniform as the Distribution type, you can enter the lot
variance value respectively.
• When you select Gaussian distribution, the label for the lot
variance changes to Sigma enabling you to enter the standard
• When you select Uniform from the dropdown list, the label
changes to Upper/Lower Bound enabling you to enter the value
for the range above/ below the mean value where sampling takes