Pspice Tutorial for Logic
Circuits Simulation
BME-2322 Logic Design
MARWA ABOUARRA
Content
1. How to open a new project?
2. How to add necessary libraries for logic circuit simulations?
3. How to add logic gates to your schematic from the library?
4. How to generate a truth table using signals?
5. How to simulate a logic circuit?
6. Build the logic circuit given in Video 3. Repeat the simulation as a practice and
add into your tutorial. Comment before and after each step.
How to open a new
project?
1
How to open a new project?
If you want to create a new PSpice project,
1. select the new project icon, which looks like that
a. another way is that you can click on File>
New> Project…
b. after doing that, a New Project box will
appear…
2. Enter the name that you would like your project to
be, then select Analog or Mixed A/D
How to open a new project?
3.
In Location, you can place your project in your desired folder. You can also create a new project and name its
folder straight through the Browse button.
And then you are going to hit OK…
4.
a Create PSpice Project box will pop up, select AnaloGNDSymbol.opj
How to open a new project?
5.
This window will appear, where “example” is the project name.
You will click twice on example.dsn to open
SCHIMATIC1 folder, then double click again on
SCHIMATIC1> PAGE1, once more double click on PAGE1
to finally open up the project’s schematic page.
After that you will face the schematic
interface where you will be drawing your
circuit, you will also see this
Just select it by left clicking on the
mouse and drag a box around it
then hit Delete button.
How to add necessary
libraries for logic circuit
simulations?
2
How to add necessary libraries for logic circuit simulations?
1. If it’s your first time installing the
software, the first thing you are going
to do in order to use the components is
adding libraries also to simulate the
circuit, in order to do that, click on
Place part (P) icon
Click on Add library
For example, write eval.olb to add it to the library
click open, and so on you can add any library
(ANALOG, SOURCE, SOURCESTM etc.…) using this
way.
How to add logic gates
to your schematic from
the library?
3
How to add logic gates to your schematic from the library?
1. To search for a specific element, you are going to select all the libraries and in the search box at the top, enter an
element that you need, also it will show you where it’s located. (AND, OR, NOT, XOR, NAND, NOR), to add it to your
schematic you must double click on it or hit enter, it will be placed on the schematic page, like so
Logic Gates
Part Name
Description
AND
7408
2-Input Positive-AND gate
OR
7432
2-Input Positive-OR gate
INVERTER (NOT)
7404
Inverter gate
NAND
7400
2-Input Positive-NAND gate
NOR
7402
2-Input Positive-NOR gate
XOR
7486
2-Input XOR gate
How to add logic gates to your schematic from the library?
The gates image in Pspice
AND
OR
NOR
XOR
INVERTER
NAND
How to generate a truth
table using signals?
4
How to generate a truth table using signals?
1. When generating a signal, you must specify the time
Data you need to give are:
a. Initial value
b. Final value
c. Rise time
d. Fall time
e. Delay
f. Period(T); T = 1/f
g. On time
For rise and fall time you need to read the data sheet for the component
2. Run it as transient
3. Stop time depends on the largest value
How to generate a truth table using signals?
A
1
0
1
0
0
0
B
0
1
1
1
A
B
AUB
0
0
0
0
1
0
1
0
0
1
1
1