User Guide

Chapter 9 AC analyses
232
AC sweep analysis
Setting up and running an AC sweep
The following procedure describes the minimum setup
requirements for running an AC sweep analysis. For more
detail on any step, go to the pages referenced in the
sidebars.
To set up and run an AC sweep
1 Place and connect a voltage or current source with an
AC input signal.
2 From the PSpice menu, select New Simulation Profile
or Edit Simulation Settings. (If this is a new
simulation, enter the name of the profile and click
OK.)
The Simulation Settings dialog box appears.
3 Choose AC Sweep/Noise in the Analysis type list box.
4 Specify the required parameters for the AC sweep or
noise analysis you want to run.
5 Click OK to save the simulation profile.
6 From the PSpice menu, select Run to start the
simulation.
What is AC sweep?
AC sweep is a frequency response analysis. PSpice
calculates the small-signal response of the circuit to a
combination of inputs by transforming it around the bias
point and treating it as a linear circuit. Here are a few
things to note:
•
Nonlinear devices, such as voltage- or
current-controlled switches, are transformed to linear
To
f
in
d
out
h
ow, see Setting up an AC
stimulus on page 9-233.
To
f
in
d
out
h
ow, see Setting up an AC
analysis on page 9-235.
To
f
in
d
out more, see How PSpice
treats nonlinear devices on
page 9-239
.
Pspug.book Page 232 Wednesday, November 11, 1998 1:14 PM