User Guide

3
-
6 Usin
g
the PSpice Optimizer
Specifications Area
The specifications area can show up to eight specification boxes
where each box represents either a goal or a constraint.
Figure 3-2 illustrates the fields contained in each box.
Fi
g
ure 3-2
Example of a Specification Box
The contents of the box varies depending on the source for the
specifications—either internal or external. The following
sections describe the differences in the initial and current value
fields, and the progress indicator.
Internal specifications
Initial value
The initial value field displays a single
performance measure that the PSpice Optimizer sets when you
start an optimization. The optimizer derives this value from the
initial optimization parameter values you defined in the
schematic (or the optimizer).
Current value
The current value field displays the
performance measure that corresponds to the current parameter
values. Current values are updated each time an optimization
iteration makes progress. When the current value satisfies the
specification (that is, the current value is within the allowed
range of the target) then the progress indicator turns from red to
green, and the PSpice Optimizer considers the specification
satisfied.
initial value
current value
enable/disable check box
pro
g
ress indicator
edit specification
hot spot
For more information on the
enable/disable check box, see
Excluding Parameters and
Specifications from
Optimization on page 3-24. For
more information on the edit hot
spot, see
Selecting a
Specification to Edit on
page 3-18.
If derivative data is available, you
can chan
g
e the value in this field
to explore how parameter values
mi
g
ht chan
g
e. See Testing
Performance when Changing
Current Values on page 3-21 for
more information.