PC/CP300 Electronics Laboratory II

Operational Amplifiers Postlab Requirements

For the two design questions, it is OK, in fact preferable, to discuss the possible approaches and solutions with your lab partner. However, I do expect each individual to write up their own solution in their lab notebook.

Did you learn anything doing this lab? Can you ...

  1. What was the biggest challenge about doing this lab?
    Discuss this as part of your summary.
  2. Design a circuit which will allow you to dynamically adjust the DC offset of an input waveform, using no voltage supplies other than the fixed op-amp voltage supplies. The circuit should have a closed-loop gain of 10. Explain your design.

    Hint: consider the simpler case where you want to take an input waveform and change its DC offset by a fixed amount.  Once you can handle the single DC offset, consider how you would dynamically change the DC offset value.
  3. Design a circuit that will map a range of input voltages [a,c]=[2,12] to a range of output voltages [b,d]=[0,5] when a is greater than b and c is greater than d. In other words, 2 volts in gives 0 volts out; 7 volts in gives 2.5 volts out; 12 volts in gives 5 volts out (linear). Explain your design.
    attenuation and offset
    Hint: break the required transformation of [2,12] to [0,5] into steps. What would you do if you had to program this?
  4. Summarize what you learned doing the lab. I strongly recommend that you do this within 24 hours of completing the lab.
  5. Photocopy your summary and the answers to these 2 questions and submit them at next week's lecture.

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