User Guide

8
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6 Tutorial: Fittin
g
Model Data (Bipolar Transistor)
The Goals and Constraints
The example circuit is set up with predefined goals which you
can view using the PSpice Optimizer.
To activate the PSpice Optimizer
1
From the Tools menu, select Run Optimizer.
The PSpice Optimizer window shows the six parameters (Is, Ikf,
Br, Bf, Ise, and Ne) and the two specifications (Ic and Ib). Ic and
Ib are defined as a goals as shown below.
The Ib settings as they appear in the Edit Specification dialog
box are shown below.
Settin
g
Ic Ib
Name Ic Ib
Reference External External
File 3055.mdp 3055.mdp
X Column Name Vbe Vbe
Y Column Name Ic Ib
Tolerance 5% 5%
Analysis DC DC
Circuit File bjtpar bjtpar
Evaluate YatX(ic(q1),!) YatX(ib(q1),!)
To display the Edit Specifications
dialo
g
box, double-click the
lower ri
g
ht-hand corner of the
specification box of interest in
the PSpice Optimizer window.
When finished browsin
g
, click
Cancel.
double-click her
e