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OrCAD_Pspice

VIEWS: 125 PAGES: 20

  • pg 1
									ECE402, Purdue University, WL




                  Basic Use of PSpice
                          via
                   ORCAD Capture




                Created by Nithin Raghunathan, August 2007
ECE402, Purdue University, WL




 This tutorial is student generated and/or inspired.

 The purpose is to allow design students to learn
 to do simple analog simulations using PSpice as
 modified by Orcad and Cadence.



                        Action                         Page   Page           Notes
1. Start the Project.                                  A-1    B-1

2. “Construct” the circuit.                            A-2    B-2
    a. Use “PSpice” devices.                           A-2    B-2    Others do not work.
    b. Picking and placing components                  A-2    B-3    R, C, and Ground
    c. Use appropriate Signal Sources for:             A-9           Summary of Sources
        1) Transient Analysis (Time Domain Response)   A-3    B-3    VSIN (series sources)
        2) AC Analysis (Frequency Response)            A-5    B-3    VAC (series sources)
        3) DC Analysis


3. Selecting and Placing Markers                       A-4    B-5    Linear and dB

4. “Simulate” the performance of the circuit.
    a. Set-up a new “Simulation Profile.”
        1) Transient Analysis (Time Domain Response)   A-4    B-6
        2) AC Analysis (Frequency Response)            A-6
        3) DC Analysis
    b. Run the simulation.                             A-5    B-7
    c. Edit the “Simulation Profile.”
        1) Transient Analysis (Time Domain Response)
        2) AC Analysis (Frequency Response)                   B-8
        3) DC Analysis
    d. Run another simulation                                 B-9

5. Save the Project                                           B-10

6. Recall and Restart                                         B-10
ECE402, Purdue University, WL


   1. Open Capture CIS

   2. Start menu > Programs > ECE Software > Cadence PSD 15.1 > Capture CIS.
      Select PCB Design Studio with Capture CIS from drop down menu, Click OK.
      (You may need to wait 5 to 20 seconds for the Design Studio blurb to vanish.)

   For those using the student version
      Start menu > Programs > Orcad Family Release 9.2 Lite edition >Capture CIS
      Lite edition

   3. To start A NEW SPICE SIMULATION, click File menu > New > Project.
      A dialog box appears as follows. Enter a name for your schematic that you would
      want to simulate. Also in the location field: select a directory location where you
      want to save the project files. Make sure the Analog or Mixed A/D is selected.




      Note : Selecting Schematic would only enable you to draw a schematic and will
      not enable you to do a PSpice simulation.

   4. In the dialog box that appears, select: “Create a blank project” to start a new
      project. For advanced users, you could select an existing project that you have
      created so that the settings would transfer to your current project.




                                         A-1
ECE402, Purdue University, WL


   5. The Schematic window should open. Click on the blank schematic page.
      A resource bar should appear on the right-hand edge of the screen.
      At this point you can begin to enter the circuit you wish to simulate.
      To place a component, click on the small “AND Gate” at the top of the bar.

      Add PSpice components:         “Add Library,”
                                      select all the components in the PSpice folder
                                      Open.




              As a precaution: When adding Parts from the Parts window select
              components which display this symbol        below the preview box.
              This indicates that there is a PSpice model available for the part
              and would therefore ensure a smoother simulation


   6. For the purpose of this tutorial, you will be creating a simple RC filter and run
      two types of analysis a time domain analysis and a frequency simulation




                                          A-2
ECE402, Purdue University, WL


   7. For the Transient analysis, first create a circuit as shown below. The source
      needed for transient analysis, in this case, has to be a sinusoidal source called
      “Vsin” available in the source.olb of the PSpice directory. Specify the parameters
      for the source by double clicking the parameter and indicating the value in the
      value field. In this case, the parameter indicated for the source is 0V offset, 1V for
      the amplitude and frequency 1 kHz.




                                                            Note: Use the 0/SOURCE from
                                                            the place ground window as the
                                                            ground for your circuit as this is
                                                            the PSpice ground.

   8. Now you would need to create a simulation profile. This is done using the new
   9. simulation profile button on the toolbar        . Give a name for the simulation
      you would want to run, in this tutorial it’s been named as “trans” and then click
      on the create button.




                                          A-3
ECE402, Purdue University, WL


   10. Now a new dialog box called the “Simulation Settings – trans” opens up. Under
       the Analysis tab, select the Time Domain in Analysis type drop down box. Setting
       the ending time for thee simulation, note that this has been set to 10ms in this case
       and then click OK, this would return you back to the schematic window.




   11. The next step in the process is to place a voltage marker at the node point that’s
       needed to be observed in the circuit. First select the voltage marker by clicking on
      the voltage marker button on the toolbar       . Next place the marker on the pin
      or node where you would want o observe the voltage and then right click and
      select end mode or press the ESC button on the keyboard. In this case, the voltage
      is observed at the output of the RC filter which is between R1 and C1. After the
      marker is placed, the circuit should look something like this:




            Similarly you can add current, power or differential voltage markers
            using the current    , power      , or differential voltage    marker
            buttons on the toolbar to measure the current or power at a node or the
            voltage between two nodes respectively
                                           A-4
ECE402, Purdue University, WL


   12. Now it’s time to run the PSpice simulation. This is done by clicking on the run
      PSpice button    on the toolbar. This starts up PSpice and brings up the output
      waveform in PSpice window as shown below if there are no errors in the
      schematic and PSpice settings. Now the transient simulation is complete.




   13. For the Frequency Analysis: Follow steps 1-4 to create the circuit shown below.
       The source used in this circuit is the Vac source found in the source.olb library in
       the PSpice folder. Set the maximum ac voltage and the dc voltage for this source
       by double-clicking on the parameters. In this tutorial the values have been set to
       1V Ac and 0V Dc.




                                                                Note: Use the 0/SOURCE
                                                                from the place ground
                                                                window as the ground for
                                                                your circuit as this is the
                                                                PSpice ground.




                                          A-5
ECE402, Purdue University, WL



   14. Follow Steps 7 except in this case the simulation profile is named as freq. Now
       the Simulation Setting – freq dialog box opens. For the frequency analysis the AC
       Sweep/Noise option is selected form the analysis type drop down box. Also
       select the sweep type and the starting and ending frequency and laso the number
       points per decade. Note that in this tutorial the Start frequency ,End frequency and
       the Points/decade have been set to 10 Hz ,1 kHz and 100 respectively. Click the
       OK to apply the setting , this takes you back to the schematic window and then
       follow step 9.




                                          A-6
ECE402, Purdue University, WL



   15. Now run the PSpice simulation clicking on the run PSpice button       on the
       toolbar. This starts up PSpice and brings up the output waveform in PSpice
       window as shown below if there are no errors in the schematic and PSpice
       settings. Now the frequency simulation is complete.




   16. Now in addition to all this the DC bias for the circuit can been seen in Capture
       schematic, after the simulation has run by clicking on the Enable Bias Voltage
      Display button in the toolbar     . This completes the PSpice tutorial




                                          A-7
ECE402, Purdue University, WL




 This tutorial is student generated and/or inspired.

 The purpose is to allow design students to learn
 to do simple analog simulations using PSpice as
 modified by Orcad and Cadence.



                        Action                         Page   Page           Notes
1. Start the Project.                                  A-1    B-1

2. “Construct” the circuit.                            A-2    B-2
    a. Use “PSpice” devices.                           A-2    B-2    Others do not work.
    b. Picking and placing components                  A-2    B-3    R, C, and Ground
    c. Use appropriate Signal Sources for:             A-9           Summary of Sources
        1) Transient Analysis (Time Domain Response)   A-3    B-3    VSIN (series sources)
        2) AC Analysis (Frequency Response)            A-5    B-3    VAC (series sources)
        3) DC Analysis


3. Selecting and Placing Markers                       A-4    B-5    Linear and dB

4. “Simulate” the performance of the circuit.
    a. Set-up a new “Simulation Profile.”
        1) Transient Analysis (Time Domain Response)   A-4    B-6
        2) AC Analysis (Frequency Response)            A-6
        3) DC Analysis
    b. Run the simulation.                             A-5    B-7
    c. Edit the “Simulation Profile.”
        1) Transient Analysis (Time Domain Response)
        2) AC Analysis (Frequency Response)                   B-8
        3) DC Analysis
    d. Run another simulation                                 B-9

5. Save the Project                                           B-10

6. Recall and Restart                                         B-10
ECE402, Purdue University, WL


INTERMEDIATE EXAMPLE, Getting Started.
1. Open Capture CIS
2. Start menu > Programs > ECE Software > Cadence PSD 15.1 >Capture CIS.
   Select PCB Design Studio with Capture CIS from drop down menu, Click OK.
   (You may need to wait 5 to 20 seconds for the Design Studio blurb to vanish.)
For those using the student version
Start menu > Programs > Orcad Family Release 9.2 Lite edition >Capture CIS Lite dition


3. To start a new PSpice simulation click File menu > New > Project. A dialog box
   appears as follows. Enter a name for your schematic that you would want to simulate.
   Also in the location field: select a directory location where you want to save the
   project files. Make sure the Analog or Mixed A/D is selected.




Note : Selecting Schematic would only enable you to draw a schematic and will not
       enable you to do a PSpice simulation.

4. In the dialog box that appears, select: “Create a blank project” to start a new
   project. For advanced users, you could select an existing project that you have created
   so that the settings would transfer to your current project.



                                          B-1
ECE402, Purdue University, WL


5. The Schematic window should open. Click on the blank schematic page.
   A resource bar should appear on the right-hand edge of the screen.
   At this point you can begin to enter the circuit you wish to simulate.
   Click on the small “AND Gate” at the top of the bar.
   Click on “Add Library,” Select all PSpice components, Open.
   Also, add      analog.olb
                  nat_semi.olb
                  source.olb
                  sourcstm.olb
                  special.olb,




              As a precaution: When adding Parts from the Parts window select
              components which display this symbol        below the preview box.
              This indicates that there is a PSpice model available for the part
              and would therefore ensure a smoother simulation




                                         B-2
ECE402, Purdue University, WL


INTERMEDIATE EXAMPLE, “Constructing the Circuit.”
6. You will need these parts shown in the figure on Page B-5.
   R/ANALOG, C/ANALOG, 0/SOURCE (COMMON or GND),

7. You will also need LM741/NS.
   To get the LM741/NS, click on the cute little AND Gate icon, enter LM741/NS,
   click on “Parts Search,” “Begin Search,” “VDC/source.olb”, OK, OK.

8. You will also need Power Supplies and “Bubbles.”

   To get the battery symbol, click on the cute little AND Gate icon, enterVDC,
   click on “Parts Search,” “Begin Search,” “VDC/source.olb”, OK, OK.

   You will need two copies of the VDC “Battery” that are set to 15 V.

    for VCC (115 V ) and VEE. ( 2 15 V )
       To place a bubble on VCC, select the ICON labeled PWR.
       connect it to the positive 15 volt supply.
       Click on the label and change the name to VCC (or 115 V, if you prefer)

       To place a bubble on VEE, select the ICON labeled PWR.
       connect it to the negatove 15 volt supply.
       Click on the label and change the name to VEE (or 215 V, if you prefer)


                    VCC
                          V2
                           15Vdc



                          V1
                           15Vdc
          0

                    VEE


   To connect the power pins on the LM741/NS, copy the VCC bubble (+15 V) to the
   page. Click on the component, choose copy and click on the page. Then flip the
   bubble by right-clicking on the bubble and choosing “Mirror Vertical.”




                                         B-3
ECE402, Purdue University, WL


9. Signal Sources and “Bubbles.”
   Unfortunately, you now need two signal sources.
   VSIN for transient analysis and VAC for frequency response analysis.
   Since they are not used simultaneously, they may be put in series.
   To get VSIN/SOURCE, click on the cute little AND Gate icon, enter VSIN.
   If it doesn’t appear as a highlighted component:
   click on “Parts Search,” “Begin Search,” “VSIN/source.olb”, OK, OK.
   To get VAC/SOURCE, click on the cute little AND Gate icon, enter VAC.
   If it doesn’t appear as a highlighted component:
   click on “Parts Search,” “Begin Search,” “VSIN/source.olb”, OK, OK.
   Then put the two in series connected to 0/SOURCE as common at the bottom.
   Get a new PWR bubble, name it SIGNAL, and attach it to the top.
    Now a copy of that bubble may serve as the signal input to your circuits.

10. Voltage Controlled Voltage Source.
   The voltage controlled voltage source, E, is a perfect amplifier: infinite input
   resistance, zero ohms output resistance, and gain not affected by frequency. It is used
   in this example to show the difference between a real Op Amp and an ideal Op Amp.
   To set up the same circuit as the Op Amp, copy the LM741 circuit.
   Then, delete the 741 and power bubbles from the copy.
   To get E1, click on the cute little AND Gate icon, enter E/ANALOG.
   If it doesn’t appear as a highlighted component, click on
   “Parts Search,” “Begin Search,” “E/analog.olb”, OK, OK.

        E1                                                                  E
        +    +
                              While the component is highlighted,                -   -
             -                right-click on a clear spot on the grid                +
        -                     and select “mirror vertically.”
                                                                                +
        E                                                                   E1
   Now insert the E1 into the circuit and wire it up.
   Since the open loop gain of the 741 is around 100,000, we will set the open loop gain
   of the ideal Op Amp at 100,000. To do this, double-click on the little circle and enter
   100000 into the GAIN column.




                                      Then click on the lower X
   That will set the value of the gain and return to your circuit.


                                              B-4
 ECE402, Purdue University, WL



                                                         C1
                                                                                   VCC
                                                         159p                            V2
                                                                                          15Vdc
                                                        R2

    SIGNAL                                              10k
                                                                                         V1

              V4                                        VEE                               15Vdc
                                                                               0
                   SIGNAL




                                                        4
                                R1
                                                                                   VEE
                                               2                       5




                                                         V-
                                                   -          OS2
              V3                1k
                                                                       6
 VOFF                                                         OUT
VAMPL                                                                      V
                                               3                       1
 FREQ                         LM741/NS             +          OS1




                                                        7
                                                   U1




                                                         V+
              0                            0
                                                        VCC
                                                         C2

                                                         159p

                                                        R4

                                                        10k




                   SIGNAL
                                R3

                                1k                             -   -
                                                              +    +       V

                                                              E1


                                           0




         Final Schematic Diagram with Voltage Markers


 12. Apply voltage markers to the outputs of the amplifiers.




                                           B-5
ECE402, Purdue University, WL


INTERMEDIATE EXAMPLE, “Conducting the Analysis.”
13. Starting a Time Domain Simulation: Transient Mode.

New Simulation Profile,         Enter “transient”,            Hit “Create.”




                                   “Run to time” is the duration
                                    of the time-domain simulation.




 Choose 0.5 usec             Hit OK to set this simulation.
 for smooth curve

14. Running the analysis




                                       B-6
ECE402, Purdue University, WL




.




                                B-7
ECE402, Purdue University, WL


INTERMEDIATE EXAMPLE, “Conducting the Analysis.”
15. Starting a Frequency Domain Simulation: AC Sweep Mode.

Edit Simulation Settings,




                                Hit OK to set this simulation.


16. Running the analysis



.




                                       B-8
ECE402, Purdue University, WL




                                B-9
ECE402, Purdue University, WL


17. Save the Project

     1. File, Save, Close

or

     2.




18. Recall and Restart the Project

     1. Open Capture CIS

     2. Start menu > Programs > ECE Software > Cadence PSD 15.1 > Capture CIS.
        Select PCB Design Studio with Capture CIS from drop down menu, Click OK.

     3. File, Open, Project, click on the appropriate “ .opj “ file.




                                           B - 10

								
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