PSPICEtutorial.pdf

ORCAD/PSPICE Tutorial

Dr. George L. Engel

Department of Electrical and Computer Engineering

Southern Illinois University Edwardsville

Edwardsville, IL

September 3, 2003

Version 1.0

Students may obtain a student version of ORCAD and SPICE by visiting

Dr. Engel's homepage at www.ee.siue.edu/~gengel. Click on the Teaching

link and then on ECE327. Download the zip file and unzip it. Install

the software by double clicking on the Setup icon. When asked if you

wish to install Schematic or Capture , select Capture.

After downloading and installing the demo version of ORRCAD, create a

shortcut to the Capture program. Place the shortcut on your desktop to

make it easy to launch the application. Also, create a folder somewhere

on your drive where you can save your schematics and your PSPICE

simulation files.

For example, here is the shortcut on my desktop. I called it ORCADdemo

ORCAD is a schematic editor. In other words, it is a program that

allows you to draw circuit schematics. The demo version that you have

downloaded comes with a nice collection of parts libraries with parts

that you are likely to use in student assignments and student

laboratory exercises.

PSPICE is an electrical simulator that allows you to simulate the

operation of the circuits whose schematic you prepared using ORCAD.

This allows students to check for correct circuit operation even before

they actually construct the circuit in lab. The demo version of ORCAD

allows you to run PSPICE without even leaving the ORCAD user interface.

Launch the ORCAD schematic editor by double-clicking on the ORCADdemo

icon.

Click on File from the main menubar and then select Open New Project .

You should then see the following dialog box.

I decided to name my project "tutorial". Notice I have entered the

Location of the folder where the schematics and my simulation results

will be saved. Use the Browse button to select the location where you

would like to save your files. Make sure the Analog or Mixed A/D

option has been selected. You may then click the OK button.

The following dialog box will appear.

Make sure to select Create a blank project and then click the OK

button.

Let's create a simple voltage divider i.e. two resistors, each with a

value of 10K W . We will drive the series combination with a sinusoid

and observe the voltage at the node between the two resistors. Voltage

division principles tell us that the voltage should be half of the

input voltage.

From the menu at the top, select Place and then Part ( Shift-P if you

wish can be used as a shortcut). The following dialog box will appear.

Click on the Add Library button and choose the ANALOG library. You

will see the following.

Select the R i.e. resistor component. This can be done by double-

clicking on the R. Place the component by clicking somewhere near the

middle of the schematic page. Click again and place R2. You should

then hit the Esc key to exit the place mode. The resistor R2 should

still be selected as is shown on the next page.

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