Pspice Tutorial 1 Csun Edu-PDF Free Download

pspice tutorial 1 csun edu

2020 | 8 views | 10 Pages | 468.24 KB

1. In this simple DC circuit there are no time varying voltages or currents. Thus, we only need to find the values of the dc voltages and currents throughout the circuit. This is referred to as a DC Bias analysis. 2. Choose the menu option: PSPICE ! New Simulation Profile. A dialog box will open. Type in the name of the simulation as "DC Bias".



factors used in PSPICE Letters immediately following a number that are not scale factors are
ignored as are letters immediately following a scale factor For example 10 10v 10Hz and 10A
all represent the same number as do 2 5m 2 5MA 2 5msec and 2 5Mohms Do NOT include
spaces in your values For example 15ohms is correct but 15 ohms is not
Table 1 PSPICE Scale Factors
Symbol Exponential Form
Note the difference between the use of M and MEG as a scale factor
Starting a New PSPICE File
To learn the fundamental steps of running a PSPICE simulation we will begin with the simple
resistive circuit shown in figure 1
Figure 1 Resistive Circuit
1 On the computer s Desktop screen click on Start move the cursor to Programs Orcad
16 2 Capture CIS Depending on the directory names that you used during the
installation these titles may read differently No license will be found if you are running the
demo version Indicate that you want to start using the demo license
2 The Orcad Capture window should open Click on File New Project
3 The New Project dialog box should open
4 Type the name of your circuit in the Name box and indicate the path to the directory in
which you want to store your file under Location
5 Click on the radio button next to Analog or Mixed A D then click OK
6 The Create PSPICE Project dialog box will appear Select Create a blank project and
7 A schematic entry window will appear The screen should now look similar to that in Figure
2 Due to the differences in versions your display may have a different appearance
Figure 2 Schematic Entry Window
Figure 3 Place Part Dialog Box
Placing the Parts
1 Select Place Part The place part dialog box will open as shown in figure 3 again it
may have a different appearance In the lower left hand corner a list of the libraries that
have been loaded will appear Your list may be different that the one shown in the figure If
this is the first time you are running PSPICE on a particular computer all of the libraries may
not appear At a minimum you should install the libraries analog eval source and special
To add a Library click on the Add Library Icon a small square above the library list in
version 16 2 The libraries listed above can be found in the following directory
tools capture library pspice demo or something similar
Add each of the four libraries listed above
2 In the Place Part dialog box click on the Analog library then click on the R in the Part
List A drawing of a resistor should appear in the lower right corner Press Enter Return
3 Move your mouse pointer over the schematic window A resistor should be following the
pointer Drag the resistor to the desired location and click once to place it
4 Drag to the next location to place the second resistor and click to place it
5 Since we want the third resistor to be vertical right click the mouse button and select
Rotate from the popup menu Then click to place the third resistor see figure 4
Figure 4 Resistor Placement
6 Once all of the resistors have been placed right click the mouse button and select End
Mode from the pop up menu This will cause the resistor to disappear Alternatively you
may enter ESC
7 Next we need to add the DC voltage source Select the Source library from the Place Part
window and the part VDC Place this on the schematic as you did with the resistors
8 Every circuit that is simulated on PSPICE must have a ground node indicated This is done
by entering the ground symbol To place the ground select Place Ground or click on the
ground symbol on the toolbar Select the Source library and the ground part labeled 0
It is very important that you use this particular ground or your simulation will not run
The first time you use this ground you may need to add the Source library from the Place
Ground window Place the ground as shown in figure 5
Figure 5 Circuit Element Placement
Wiring the schematic
1 Select the Place Wire button from the toolbar
2 Drag the cross hair pointer to the positive end of the VDC source Click on it
3 Move the cross hair pointer to the left terminal marker of the first resistor Click on it
4 Repeat the procedure until all components are connected
5 Click the right mouse button Select End Wire and click on it Your schematic should now
appear as the one in figure 6
Figure 6 Wired Circuit
Setting the component values
1 All of the resistor values default to 1K To change a resistor value double click on the
resistor value The Display Properties box appears
2 In the Value box type in the desired resistance Make sure to use the appropriate suffix as
listed in the PSPICE introduction Click on OK
3 Repeat for all resistors
4 Using the same procedure change the value of the dc voltage source to 10V The circuit
should now appear as the one in figure 7
Figure 7 Circuit with Component Values
Specifying the type of analysis
1 In this simple DC circuit there are no time varying voltages or currents Thus we only need
to find the values of the dc voltages and currents throughout the circuit This is referred to as
a DC Bias analysis
2 Choose the menu option PSPICE New Simulation Profile A dialog box will open
Type in the name of the simulation as DC Bias Click Create
3 The Simulations Settings dialog box opens Under Analysis Type select Bias Point and
4 Save your circuit
Running the Simulation
1 Select the menu option PSPICE Run The simulation will run and the simulation
window will open as shown in figure 8
2 In the lower left corner of the window is an output text section that displays the progress of
the simulation and any errors that were encountered The remaining sections will be
discussed later
3 In this example we will view the results of the simulation as a SPICE output file Select the
menu option View Output File A text file will appear in the upper window Figure 9
shows the output and describes each section Note that the default output includes the
voltage at each node and the current flowing through each voltage source For example the
initial circuit listing in the output shows us that the 3K resistor is connected between nodes
N00132 and N00159 The output indicates that the voltages at those two nodes are 8 and 5
volts respectively Thus this resistor has 3 volts across it
Figure 8 Simulation Window
03 29 01 13 17 18 PSpice Lite Mar 2000
Profile SCHEMATIC1 dc bias C Program Files OrcadLite project1 SCHEMATIC1 dc bias sim
CIRCUIT DESCRIPTION
Creating circuit file project1 SCHEMATIC1 dc bias sim cir
WARNING THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT
SIMULATIONS
Local Libraries
From PSPICE NETLIST section of C Program Files OrcadLite PSpice PSpice ini file
lib nom lib
Analysis directives
PROBE V I W D NOISE
INC project1 SCHEMATIC1 net
INCLUDING project1 SCHEMATIC1 net
source PROJECT1 This section is the listing that describes the
R R1 N00102 N00132 2K
R R2 N00132 N00159 3K
circuit that you have drawn Note that there
R R3 0 N00159 5K is one line for each component This line
V V1 N00102 0 10V lists the component values and the numbers
of the nodes that it is connected between
RESUMING project1 SCHEMATIC1 dc bias sim cir
03 29 01 13 17 18 PSpice Lite Mar 2000
Profile SCHEMATIC1 dc bias C Program Files OrcadLite project1 SCHEMATIC1 dc bias sim
SMALL SIGNAL BIAS SOLUTION TEMPERATURE 27 000 DEG C
NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE
N00102 10 0000 N00132 8 0000 N00159 5 0000
This section lists each node
VOLTAGE SOURCE CURRENTS
NAME CURRENT
number and the corresponding
voltage at that node It also lists
V V1 1 000E 03 the current flowing through each
voltage source
TOTAL POWER DISSIPATION 1 00E 02 WATTS
JOB CONCLUDED
TOTAL JOB TIME 13
Figure 9 PSPICE Output File
4 Return to the window with your schematic Select PSPICE Bias Points Enable Bias
Voltage Display if it is not already selected The dc bias voltages will now be displayed
directly on your diagram eliminating the need to view the output file at all See figure 10
Experiment with displaying the current and power values
Figure 10 Schematic with Bias Voltage Display
Current Sources
A DC independent current source can be found in the parts list as IDC This is similar to the
voltage source used above except the current is held at a specified value
Displaying Currents and Power
In addition to displaying voltages current and power values found in the bias point analysis can
also be displayed Enter the schematic shown in Figure 11 Perform the DC bias point analysis
Select PSPICE Bias Points Enable Bias Power Display Confirm that the power values
displayed are correct
Figure 11 DC Analysis Problem


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