E11 Lab #2
2007

Introduction to Op Amps

Information for your Lab Report

Lab report due the next time you come to lab.
This lab requires a formal lab report.

If you are having a lot of trouble with part of the report, please come see me.  I don't want the writing of the lab report to be an exercise in frustration, so if you get stuck, please don't hesitate to ask for help.  Also, if you find you are missing some data, or it just doesn't make sense, please talk to me before finishing your report.


  1. The inverting configuration.

  2. The non-inverting programmable-gain configuration.


The inverting configuration.

This lab requires a formal lab report.  However, make sure, that within that format, you include (at least) the following derivations/results for the inverting configuration.  They should be included as prose in your report (they are enumerated below only to make it easier to follow).

  1. Show the derivation of the relationship between input and output for the inverting configuration.

  2. Show your lab results (without distortion).

  3. Do a MultiSim simulation of your circuit.

  4. Compare your lab (measured) results directly to your expected (theoretical and MultiSim) results. 

  5. Show your lab results (with distortion).  What is the limiting factor in the magnitude of the output of the op-amp?

Make sure all graphs and tables have appropriate labels and units.  Make sure every graph and table is referenced in the report.  Don't include large tables of numbers where a graph is more useful (if absolutely necessary, you can include such a table as an appendix).  Where possible, directly compare measured and theoretical results on a single graph/table.

The non-inverting programmable-gain configuration.

Make sure you include (at least) the following derivations/results for the non-inverting configuration.

  1. Show the derivation of the relationship between input and output for the non-inverting configuration.

  2. Consider the programmable non-inverting configuration shown below.

    1. Calculate the gains of the circuit  in terms of Ra, Rb and RF for the four configurations of the switches:

    2. Sb Sa Gain
      open open  
      open closed  
      closed open  
      closed closed  
    3. Now calculate the gains when Ra=20kΩ, and Rb=10kΩ and RF=20kΩ.

    4. Sb Sa Gain
      open open  
      open closed  
      closed open  
      closed closed  
    5. Present your lab results, and compare them to your expected results.  Calculate the error and speculate on its origins.  You should include experimental and theoretical results side-by-side (e.g., in the same table).

Include the following sections as an appendices:

Make sure all graphs and tables have appropriate labels and units.  Make sure every graph and table is referenced in the report.  Don't include large tables of numbers where a graph is more useful (if absolutely necessary, you can include such a table as an appendix).  Where possible directly compare measured and theoretical results on a single graph/table.


Here is a link to the grading sheet I will use, so you can see how much each part of the lab is worth, and what I will be looking for.  Also refer to the formal lab report format.


Foxtrot 2 

email me with any comments on how to improve the information on this page (either presentation or content), or to let me know if you had any particular difficulties with this lab.

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