User Guide

3
-
24 Usin
g
the PSpice Optimizer
Ensurin
g
reliable results when tweakin
g
values
Because the PSpice Optimizer uses derivative data to estimate
what will happen when a parameter or a specification is
changed, and because the design usually depends on the
parameters in a highly nonlinear way, results are typically
reliable only for small changes in values. Once you have
significantly changed values, resimulate and recompute the
derivatives before adjusting values any further.
To ensure that results are reliable after si
g
nificant
tweakin
g
1
From the Tune menu, select Update Performance.
The PSpice Optimizer will run the appropriate simulations
and update the specifications.
2
From the Tune menu, select Update Derivatives.
You are now ready to continue exploring the design.
Excludin
g
Parameters and
Specifications from Optimization
Every specification and parameter has a check box that you can
select to exclude that specification or parameter from the next
optimization run.
To exclude a parameter or specification from an
optimization
1
Do one of the following:
• In the PSpice Optimizer window, clear the check box
(check box should be empty) to the left of the parameter
or specification name.
• Double-click the lower right-hand corner of the box for
the parameter or specification you want to exclude,
clear the Enabled check box (check box should be
empty) in the dialog box, and click OK.
enable/disable check box
double-click here