User Guide

Explorin
g
the Effect of Parameter and Specification Chan
g
es 3
-23
Manuall
y
recalculatin
g
performance
When you want to change multiple values before recalculating
performance, disable recalculation. As with automatic
recalculation, derivative data is required.
To test performance usin
g
manual recalculation
1
Disable automatic recalculation.
a
From the Options menu, select Recalculate.
b
In the When frame, select Manual.
c
Click Close.
2
From the Tune menu, select Update Derivatives.
When derivative data is calculated, the message
Derivs.
Avail
appears in the title bar.
3
Change the current value for the parameter or specification
you want to investigate.
a
Double-click in the current value (upper) field for a
parameter or specification.
b
Enter the new value.
c
Press J.
4
From the Options menu, select Recalculate to
recalculate performance.
5
Select the kind of recalculation as follows:
• If you entered a new parameter value, click Results.
The PSpice Optimizer recalculates performance. A
small ‘
e’ appears next to the progress indicator for each
recalculated specification to show that the value is an
estimate based on derivative data.
• If you entered a new specification value, click
Parameters.
The PSpice Optimizer recalculates values for all of the
parameters based on the current specification values.
When frame in the
Recalculate dialo
g
box
Tune menu
The PSpice Optimizer accepts
numerical entries in any format
supported by PSpice. Refer to
the online
MicroSim PSpice A/D
R
eference Manual for a
complete list of supported
numeric forms.
click here to recalculate
specifications
click here to recalculate
parameters