eldo_user

Optimization
Optimization Commands
.PARAMOPT
+ L=(10U, 2U, 100U)
+ W=(60U, 2U, 200U)
This statement defines an initial length of 10μm and an initial width of 60μm. The length is
allowed to vary between 2μm and 100μm and the width can vary between 2μm and 200μm.
The .EXTRACT and .MEAS commands can be used to specify design objectives where they are
represented by a single number (scalar version) or represented by a vector of measures. These
are regular .EXTRACT and .MEAS command statements with additional optimization
parameters. The syntax for the .EXTRACT command is:
.EXTRACT
+ [EXTRACT_INFO] [LABEL=NAME] [FILE=FNAME]
+ [VECT] [CATVECT] $MACRO|FUNCTION
+ [OPTIMIZER_INFO]
The .MEAS command (the HSPICE-compatible equivalent of .EXTRACT) shares all of the
same syntax and parameters.
The .OBJECTIVE command can also be used to specify the design objectives. It is dedicated to
optimization and can be used for more complex objectives. The syntax is:
.OBJECTIVE
+ EXTRACT_INFO [LABEL=NAME]
+ {$MACRO|FUNCTION}
+ OBJECTIVE_INFO
+ [SCALING_INFO]
+ [MONITOR_INFO]
+ [PRINT_INFO]
In the following example the design objective is specified using an .OBJECTIVE command. It
shows the optimization of the phase margin for an operational amplifier in closed-loop
configuration:
.OBJECTIVE AC
+ LABEL=phasemarg(XYCOND(VP(out),VDB(out)