User`s guide

Files Needed for Simulation 1
-13
Before starting simulation, PSpice A/D needs to read other files
that contain simulation information for your circuit. These are
model files, and if required, stimulus files and include files.
You can create these files using MicroSim programs like the
Stimulus Editor and the Parts utility. These programs automate
file generation and provide graphical ways to verify the data. Or,
you can use any text editor, like the MicroSim Text Editor, to
enter the data manually.
Model librar
y
A model library is a file that contains the electrical definition of
one or more parts. PSpice A/D uses this information to
determine how a part will respond to different electrical inputs.
These definitions take the form of either a:
• model parameter set, which defines the behavior of a part by
fine-tuning the underlying model built into PSpice A/D, or
• subcircuit netlist, which describes the structure and function
of the part by interconnecting other parts and primitives.
The most commonly used models are available in the MicroSim
model libraries shipped with your programs. The model library
names have a
.lib extension.
If needed, however, you can create your own models and
libraries, either:
• manually using the model editor in Schematics or some
other text editor, or
• automatically using the Parts utility.
The circuit file (.cir) that
Schematics
g
enerates contains
references to the other user-
confi
g
urable files that PSpice A/
D needs to read.
not
included
in:
A subcircuit, sometimes called a
macromodel , is analo
g
ous to a
procedure call in a software
pro
g
rammin
g
lan
g
ua
g
e.
not
included
in:
See What is
the Parts
Utility? on
page 1-10
for a
description.