User Guide

Monitorin
g
Pro
g
ress with Probe 8
-9
3
Define the display configuration to use when optimizing.
For the BJT example, this is predefined. To verify the
display name:
a
In the PSpice Optimizer, from the Options menu, select
Defaults.
The display name,
icibe, appears in the Display text
box and the DC analysis type is selected.
b
When finished, click Cancel.
4
Measure performance and redisplay the traces in Probe:
a
In the PSpice Optimizer, from the Tools menu, select
Update Performance.
The optimizer automatically updates the Probe display.
When the iteration is complete, the Probe display
should look something like the one shown in Figure 8-2.
This display compares the curves for Ic and Ib with
curves for an instance of a 2N3055. The percentage
error for Ic and Ib is also displayed in the uppermost
plot.
Fi
g
ure 8-2
Initial Traces for the Ic and Ib Parameters
In some re
g
ions of the device
characteristic, the measured
currents are relatively insensitive
to chan
g
es in the parameters.
Because of this, the value of
Delta is increased to 3% from its
default value of 1%. See
Controlling Finite Differencing
when Calculating Derivatives
(Delta Option) on page 4-13 for
more information.