User Guide

Using the Model Editor to edit models
97
model libraries containing appropriate model and
subcircuit definitions.
Analyzing the effect of model parameters
on device characteristics
You can also edit model parameters directly and see how
changing their values affects a device characteristic. As
you change model parameters, the Model Editor
recalculates the behavior of the device characteristics and
displays a new curve for each of the affected ones.
How to fit models
For a given model, the Model Editor displays a list of the
device characteristics and a list of all model parameters
and performance curves (see Figure 29).
Figure 29 Model Editor workspace with data for a bipolar
transistor.
For more in
f
ormation a
b
out t
h
e
characteristics of devices supported by the
Model Editor, refer to the online OrCAD
PSpice A/D Reference Manual.
Pspug.book Page 97 Wednesday, November 11, 1998 1:14 PM