EE 124 Lab Web Site  - PSPICE & Schematic File Downloading 

PSPICE

        PSPICE is a Circuit Simulation program originally created by Microsim. The file size is 16 MB. There are several ways to obtain it:

1. Get PSPICE directly at Orcad's  Ftp site at ftp://ftp.orcad.com/dwn_file/Pspice/Eval_Versions/ and click on 80dlabe.exe.
2. The PSPICE CD sold in IEEE is Orcad version 9.1 and is not compatible with the lab.
3. Download it directly here.

A. How to Download Schematic Files:

To download Schematic Files:
    Using Internet Explorer:
        1. Right Click Mouse over filename.
        2. Select Save Target As...
        3. Choose Directory Location for file to be saved.
        4. Save File.

    Using Netscape Navigator/Communicator
        1. Right Click Mouse over filename.
        2. Select Save Link As...
        3. Choose Directory Location for file to be saved.
        4. Save File.

B. Open a Schematic File under PSPICE:

        1. To prevent possible PSPICE conflict errors, shutdown Internet Explorer/Netscape Communicator.
        2. Start up PSPICE:
          a. Select Start Menu.
          b. Select Programs from the Start Menu.
          c. Go to the Pop-up menu that appears on the right and select Microsim Eval 8 (or DesignLab Eval 8).
          d. Finally, select Schematics from the new Pop-up menu that appears on the right.
        3. Select either the File Open Icon or File-Open on the top toolbar and choose the file to open.

          Experiment 0: Familiarization with SPICE

            This experiment involves building and simulating several simple circuits in PSPICE. Its main objective to to allow the student to familiarize themselves with the program.
    On-site tutorial: Introduction to PSPICE
    Description of Experiment 0

Experiment 1: Introduction to the Digital Oscilloscope

            In this experiment, the student will learn how to properly use the lab equipment available. The focus is on the HP 33120A Function Generator and HP 54602B Digital Oscilloscope. One thing to remember from this experiment is to always set the correct impedance matching value on the Function Generator. If not, the display on the Function Generator will not match its actual output value.

            Circuit Test Schematic         Download v8.0 Schematic : Lab1-Fig1.sch
           Description of Experiment 1

Experiment 2: A Simple Current Mirror (2 weeks)

            The current mirror is a fundamental component of many analog circuit design. In this experiment its behavior will be studied. The current mirror is a way to generate a current source in real life circuits.

            Basic Current Mirror    Download v8.0 Schematic : Lab2-Fig1.sch

            Current Mirror with Degenerative Resistances
                         Download v8.0 Schematic : Lab2-Fig2.sch
            Description of Experiment 2

Experiment 3: Elements of Differential Amplifiers (2 weeks)

            Differential Pair is a type of circuit that will allow the difference of two input voltages to be detected. The Differential Pair, which is a part of the total Differential Amplifier circuit studied in this experiment, is very important as it is the first stage in many amplifier circuits. In this experiment the behavior and characteristcs of such a circuit is studied.
            Common Mode means that the potential of both inputs are equal at a certain voltage level. Differential Mode means different potentials for each input of the Amplifier.

            Amplifier Circuit     Download v8.0 Schematic : Lab3-Fig1.sch

            Common Mode and Difference Mode Generator
                            Download v8.0 Schematic : Lab3-Fig2.sch

            Common Mode Generator        Download v8.0 Schematic : Lab3-Fig3.sch

            Difference Mode Generator     Download v8.0 Schematic : Lab3-Fig4.sch

Experiment 4: Operational Transconductance Amplifier (LM3080 and/or LM13700)

            A Transconductance Amplifier outputs a current in function of the diffrential input voltages. The previous experiments are what can be called the first stage of a Transconductance Amplifier. Here the student will deal with a IC Transconductance Amplifier (LM3080 and/or LM13700) in an Open Loop configuration.

            PSPICE approximative model of the LM13700
                          Download v8.0 Schematic: Prelab4_LM13700.sch
                    Related links,
                       Analog Artist (San Fransisco Chronicle):
           http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/1999/02/01/BU78272.DTL
                       LM13700 Datasheet in PDF form (including great suggestions for lab projects):
           http://www.national.com/ads-cgi/viewer.pl/ds/LM/LM13700.pdf

Experiment 5: A Feedback Amplifier Design Exercise (2 weeks)

            One of the methods to improve the characterics of an Amplifier is to use it in a Closed Loop configuration. In this experiment the student has to design a Closed Loop Amplifier Circuit with characteristics following a given specification.
            To specify ABET criteria, the student must also submit a FULL final report for this Experiment.

    Feedback Circuit Example Download v8.0 Schematic: Lab5a.sch

    Example Feedback Circuit created by Professor Wunsch
                         Download v8.0 Schematic: Lab5c.sch

Feedback design verification

Experiment 6: The Effects of Frequency Compensation

             All the circuits studied so far in the experiment are at a generally fixed frequency. In real life however, the characteristics of a circuit changes according to its functional frequency. Therefore in this experiment, the student will use the LM748 Operational Amplifier to study the effects of a Frequency Compensation by a Capacitance.
           A special note to remember about this experiment is the Gain Bandwidth Product in function of the Compensation Capacitor.

Experiment 7: An Individually Selected Lab

         This is it !! Here is where the student gets to show off how good an engineer they really are. In this Lab, the student will design an experiment and also the questions to be asked.
            As in Experiment 5, to specify ABET criteria, the student must also submit a FULL final report for this Experiment.