User Guide

Analog example
341
Analog example
In this section, basic techniques for performing waveform
analysis are demonstrated using the analog circuit
EXAMPLE.OPJ.
Figure 95 Example schematic EXAMPLE.OPJ.
Running the simulation
The simulation is run with the Bias Point Detail,
Temperature, and Transient analyses enabled. The
temperature analysis is set to 35 degrees. The transient
analysis is setup as follows:
Print Step 20ns
Final Time 1000ns
Enable Fourier selected
Center Frequency 1Meg
Output Vars V(OUT2)
To start the simulation
1 From Capture’s File menu, point to Open and choose
Project.
2 Open the following project in your OrCAD program
installation directory:
T
h
e examp
l
e project EXAMPLE.OPJ is
provided with your OrCAD programs.
When shipped, EXAMPLE.OPJ is set up with
multiple analyses. For this example, the AC
sweep, DC sweep, Monte Carlo/worst-case,
and small-signal transfer function analyses
have been disabled. The specification for
each of these disabled analyses remains
intact. To run them from Capture in the
future, from the PSpice menu, choose Edit
Simulation Settings and enable the
analyses.
Note W
h
en you run a Fourier ana
l
ysis
using PSpice as specified in this example,
PSpice writes the results to the PSpice
output file (*.OUT). You can also use Probe
windows to display the Fourier transform of
any trace expression by using the FFT
capability in PSpice. To find out more, refer
to PSpice A/D online Help.
Pspug.book Page 341 Wednesday, November 11, 1998 1:14 PM