User Guide

Chapter 3 Preparing a design for simulation
60
Using parts that you can
simulate
The OrCAD part libraries supply numerous parts
designed for simulation. These include:
• vendor-supplied parts
• passive parts
• breakout parts
• behavioral parts
At minimum, a part that you can simulate has these
properties:
• A simulation model to describe the part’s electrical
behavior; the model can be:
• explicitly defined in a model library,
• built into PSpice, or
• built into the part (for some kinds of analog
behavioral parts).
• A part with modeled pins to form electrical
connections in your design.
• A translation from design part to netlist statement so
that PSpice can read it in.
Note Not all parts in the libraries are set up for simulation. For example,
connectors are parts destined for board layout only and do not
have these simulation properties.
T
h
e OrCAD part
l
i
b
raries a
l
so inc
l
u
d
e
special parts that you can use for
simulation only. These include:
• stimulus parts
to generate
input signals to the circuit (see
Defining stimuli
on
page 3-75
)
• ground parts
required by all
analog circuits, which need reference
to ground
• simulation control parts
to do things like set bias values (see
Appendix A,
Setting initial
state
)
• output control parts
to do
things like generate tables and
line-printer plots to the PSpice output
file (see
Chapter 14,
Other
output options
)
Pspug.book Page 60 Wednesday, November 11, 1998 1:14 PM