User Guide

Defining stimuli
75
Defining stimuli
To simulate your circuit, you need to connect one or more
source parts that describe the input signal that the circuit
must respond to.
The OrCAD libraries supply several source parts that are
described in the tables that follow. These parts depend on:
• the kind of analysis you are running,
• whether you are connecting to the analog portion of
your circuit, and
• how you want to define the stimulus: using the
Stimulus Editor, using a file specification, or by
defining part property values.
Analog stimuli
Analog stimuli include both voltage and current sources.
The following table shows the part names for voltage
sources.
Table 13
If you want this kind of input... Use this part for voltage...
For DC analyses
DC bias VDC or VSRC
For AC analyses
AC magnitude and phase VAC or VSRC
For transient analyses
exponential VEXP or VSTIM*
periodic pulse VPULSE or VSTIM*
piecewise-linear VPWL or VSTIM*
piecewise-linear that repeats
forever
VPWL_RE_FOREVER or
VPWL_F_RE_FOREVER**
See Setting up a DC stimulus
on
page 8-218
for more details.
See Setting up an AC stimulus
on
page 9-233
for more details.
See Defining a time-based
stimulus on page 10-252
for more
details.
Pspug.book Page 75 Wednesday, November 11, 1998 1:14 PM