Experiment 5: Operational Amplifier

  • Circuits on the breadboard
  • Integrator
  • Non-inverting Schmitt trigger
  • Triangle–square-wave generator
  • Pulse-width modulation and control of a DC motor

Preparation for the laboratory

in the ILIAS course

Read the materials for Experiment 5 here.
They will be published one week before the experiment.

Preparation for the oral short exam

For this experiment, you should be able to apply and explain the following concepts:

  1. „golden rules“ for the negatively feedback, idealized operational amplifier
  2. deviating properties of the real operational amplifier (e.g., output swing range, slew rate)
  3. output-voltage waveform $U_A$ of the inverting integrator (inverting integrator) for different input voltages $U_E$, e.g.
    1. DC voltage
    2. square-wave voltage
    3. arbitrary voltage waveform
  4. integration time constant of the inverting integrator
  5. Schmitt trigger
    1. difference in feedback compared to the inverting integrator
    2. idealized relationship between $U_E$ and $U_A$
    3. idealized line diagram: $U_E$ and $U_A$ as a function of time
    4. switching thresholds
    5. threshold voltage
    6. hysteresis
    7. real behavior: output „in saturation“
  6. structure of the triangle–square-wave generator