User Guide

The Bipolar Transistor Test Case 8
-5
The Anal
y
sis
The BJT example is set up for a DC sweep of the voltage source
which provides a range of values for Vbe. These values should
match the measurement points contained in the external data
file. Ic and Ib are measured at values of Vbe starting from 0.4 V,
incrementing by 0.01 Vto a maximum of 0.82 V.
The External File of Measured
Data
There are two measured curves: Ic and Ib. Each of these has an
associated PSpice Optimizer specification. When fitting model
parameters, specifications are different from those used in other
kinds of optimizations because they reference an external data
file.
For the BJT example, both sets of measured data are contained
in the
3055.mdp file. A portion of this file is shown below.
The file contains 3 columns of data: Vbe, Ic, and Ib. The first
non-blank line in the file contains names for the columns of data.
These map to the specification setup in the PSpice Optimizer.
Vbe Ic Ib
4.000E-01 6.047E-06 2.655E-06
4.100E-01 8.900E-06 3.253E-06
4.200E-01 1.310E-05 3.989E-06
4.300E-01 1.928E-05 4.897E-06
•
•
•
8.100E-01 8.002E+00 1.922E-01
8.200E-01 9.092E+00 2.371E-01