eldo_user

Chapter 7
Running Parametric Analyses
Parametric analysis enables you to specify ranges of values for components, semiconductor
parameters, and other circuit parameters, and then analyze the circuit over these specified
values. This is called sweeping parameters.
Temperature Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Assigning Parameter Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Sweeping Parameters Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
.STEP Sweeping Parameters Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Nested Sweeps Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
.DATA Parameter Sweeps Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Altering Netlist Data For Simulation Reruns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
Removing .EXTRACT Statements from a Simulation Rerun . . . . . . . . . . . . . . . . . . . . . . 299
Controlling Alter Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
.ALTER Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Using Output Results From a Previous Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Temperature Handling
Eldo enables temperature handling in a number of ways.
The order of priority of the following temperature related commands and parameters is, with
decreasing priority: T (TEMP or DTEMP), then TMOD (or TNOM), and then .TEMP. That is,
T has the highest priority.
• .TEMP command.
Specifies the circuit simulation temperature. You can specify this to execute several
successive simulations at various temperatures.
See “.TEMP” in the Eldo Reference Manual.
• Keyword TEMP in .DC analysis command.
.DC followed by the TEMP keyword results in a variation of temperature.
See “.DC” in the Eldo Reference Manual.
• TNOM option (.OPTION).
Sets the default model reference temperature for parameters provided in the .MODEL
statement (temperature at which the default model parameters were extracted). Default
Eldo® User's Manual, 15.3 287