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ORCAD PSPICE
In order to start using the software, you will have to
create a new Project. Go to FileNewProject. A
window will appear and you have to provide a new
project name and browse for a location
Another window will appear; choose ‘Create a Blank Project’.
To start designing your circuit,
you need to ‘Add Parts’ using the
symbol.
However, you will need to add
one or more libraries in order to
access particular parts. To add the
libraries, click the ‘Add Library’
icon.
Then, a second dialog opens with a list of libraries.
Select all the libraries using the ‘Shift’ key and then click the ‘Open’
button.
ADD PARTS
• For resistors, capacitors – category is
ANALOG
• For voltage/current supplies – category is
SOURCE
• For specified device with code such as
D1N4148 (Silicon Diode) – EVAL
• REMEMBER!
• Every schematic MUST have
GROUND
• CAPSYM  0
• Square Wave is the VPLUSE function in the limit of TR = TF = 0 and PW =
0.5 * PER (PER is the period of the wave). This limit case, however, causes
numerical difficulties in calculations.
• A good choice for TR is to set it to be 1% of the PER (a period): TR = TF =
0.01 * PER, PW = 0.48 * PER. This usually results in a nice signal without a
huge amount of computational need.
• Note that TR does not have to be exactly 1% of PER. You can choose nice
round numbers for TR, TF, and PW.
V1 = 0V
V2 = 12V
TD = 0
TR = 0.000001s
TF = 0.000001s
PW = 250s
PER = 500s
PER
V1
V1
V2
PW
TR
TF
t(s)
• For a sine wave, use VSIN for your voltage source
instead of VAC
– VOFF is the DC offset – generally set to zero
– VAMPL is the amplitude, and FREQ is the frequency of the
sine wave
– AC is set to zero
VOFF = 0V
VAMPL = 9V
FREQ = 1000 Hz
AC = 0
V1
SIMULATION PROFILE
• You need to create New Simulation Profile
• Create a name for your simulation profile
The default simulation setting – Time Domain
• After that, you can run your simulation by
clicking the PLAY button
Run PSPICE
MARKERS
Enable Current
Display
Voltage
Marker
Current
Voltage
Differential Marker
Marker
Enable Voltage
Display
Enable Voltage Display and Enable Current Display can only be
used when you set the Simulation Profile as Time Domain
The voltages shown there are node voltages i.e reference to the ground.
So, if you need to find the voltage across R1, you use voltage differential marker
Theoretically, VR1 = 10 – 3.33 = 6.667V
How to save the graph?
PRINT SCREEN? Can…
Easier way: At the Simulation Output - Go to Window – Copy to Clipboard
• Go to the desired destination such as Power
Point or Word
• Press Ctrl + V
• To save the raw data to Excel (for example)
• Click on the legend displayed on your simulation graph – once
you clicked it will turn red
• Press Ctrl + C
• Go to Excel and press Ctrl + V