User Guide

AC sweep analysis
237
AC sweep setup in example.opj
If you look at the example circuit, EXAMPLE.OPJ,
provided with your OrCAD programs, you’ll find that its
AC analysis is set up as shown in Figure 61.
Figure 60 Circuit diagram for EXAMPLE.OPJ.
Frequency is swept from 100 kHz to 10 GHz by decades,
with 10 points per decade. The V1 independent voltage
source is the only input to an amplifier, so it is the only AC
stimulus to this circuit. Magnitude equals 1 V and relative
phase is left at zero degrees (the default). All other voltage
sources have zero AC value.
Note
T
h
e source, V1, is a VSIN source t
h
at
is normally used for setting up sine wave
signals for a transient analysis. It also has
an AC property so that you can use it for an
AC analysis.
To find out more about VSIN and other
source symbols that you can use for AC
analysis, see Using time-based
stimulus parts with AC and DC
properties on page 3-77
.
Pspug.book Page 237 Wednesday, November 11, 1998 1:14 PM