User Guide

Default Options 4
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Then the scaled values are:
and ,
respectively.
Since these numbers are close enough in magnitude, the PSpice
Optimizer can combine them without losing numerical
significance.
Default Options
This section describes the basic configuration options for the
PSpice Optimizer.
To displa
y
the Options dialo
g
box
1
From the Options menu, select Defaults.
Controllin
g
Finite Differencin
g
when Calculatin
g
Derivatives (Delta Option)
The Delta option specifies the relative amount (as a percentage
of current parameter value) by which the PSpice Optimizer
perturbs each parameter from its initial value when calculating
the derivatives.
Specification
Tar
g
et
Value
Allowed
Ran
g
e
Measured
Value
collector-base
capacitance
10 pF ±1 pF 8 pF
collector resistance 10 k ±1 k 12 k
8pF 10pF–
()
1pF
--------------------------------- 2–=
25k 10k–
1k
------------------------ 15=
The PSpice Optimizer saves
option settin
g
s to the .opt file so
that they remain with the
optimization’s parameter and
specification settin
g
s.
To
g
enerate a summary of the
option settin
g
s for a
g
iven
desi
g
n, select Report from the
File menu.