User Guide

How are models organized?
89
Model library configuration
PSpice searches model libraries for the model names
specified by the MODEL implementation for parts in your
design. These are the model definitions that PSpice uses to
simulate your circuit.
For PSpice to know where to look for these model
definitions, you must configure the libraries. This means:
• Specifying the directory path or paths to the model
libraries.
• Naming each model library that PSpice should search
and listing them in the needed search order.
• Assigning global or design scope to the model library.
Global vs. design models and libraries
Model libraries and the models they contain have either
design or global application to your designs.
Design models Design models apply to one design.
The schematic page editor automatically creates a design
model whenever you modify the model definition for a
part instance on your schematic page. You can also create
models externally and then manually configure the new
libraries for a specific design.
Global models Global models are available to all
designs you create. The part editor automatically creates a
global model whenever you create a part with a new
model definition. The Model Editor also creates global
models. You can also create models externally and then
manually configure the new libraries for use in all designs.
To optimize t
h
e searc
h
, PSpice uses
indexes. To find out more about this and
how to add, delete, and rearrange
configured libraries, see Configuring
model libraries on page 4-120
.
To
f
in
d
out
h
ow to c
h
ange t
h
e
d
esign an
d
global configuration of model libraries, see
Changing design and global
scope on page 4-123
.
Examp
l
e usage: To set up
d
evice an
d
l
ot
tolerances on the model parameters for a
particular part instance when running a
Monte Carlo or sensitivity/worst-case
analysis.
PSpice searc
h
es
d
esign
l
i
b
raries
b
e
f
ore
global libraries. To find out more, see
Changing model library search
order on page 4-124
.
Pspug.book Page 89 Wednesday, November 11, 1998 1:14 PM