User`s guide

10
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2 AC Analyses
AC Sweep Anal
y
sis
What You Need to Do to Run an
AC Sweep
The following procedure describes the minimum set of things
that you need to do to run an AC sweep analysis. For more detail
on any step, go to the page referenced in the sidebar next to the
step.
To set up and run an AC sweep
1
Place and connect a voltage or current source with an AC
input signal.
2
Set up the AC sweep simulation specification and enable the
analysis by doing one of the following:
• If you have not yet specified the simulation parameters,
complete the AC Sweep and Noise Analysis dialog box
as needed.
• If you disabled the AC sweep analysis after having set
up the simulation parameters, then in the Analysis Setup
dialog box, select (
✓) the AC Sweep check box to
enable it.
3
Start the simulation.
What is AC Sweep?
AC sweep is a frequency response analysis. PSpice A/D
calculates the small-signal response of the circuit, linearized
around the bias point, to a combination of inputs. Here are a few
things to note:
• Nonlinear devices, such as voltage- or current-controlled
switches, are linearized about their bias point value before
PSpice A/D runs the linear (small-signal) analysis.
To find out how, see Setting Up
an AC Stimulus on page 10-3.
To find out how, see Setting Up
an AC Analysis on page 10-5.
To find out how, see Starting
Simulation on page 8-11.
To find out more, see How
PSpice A/D Treats Nonlinear
Devices on page 10-7.