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Subelement D
Circuits
Section 30
Op Amps
What is the main advantage of using an op-amp audio filter over a passive LC audio filter?
  • Op-amps are largely immune to vibration and temperature change.
  • Most LC filter manufacturers have retooled to make op-amp filters.
  • Op-amps are readily available in a wide variety of operational voltages and frequency ranges.
  • Correct Answer
    Op-amps exhibit gain rather than insertion loss.
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What are the characteristics of an inverting operational amplifier (op-amp) circuit?
  • It has input and output signals in phase.
  • Input and output signals are 90 degrees out of phase.
  • Correct Answer
    It has input and output signals 180 degrees out of phase.
  • Input impedance is low while the output impedance is high.
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Gain of a closed-loop op-amp circuit is determined by?
  • The maximum operating frequency divided by the square root of the load impedance.
  • Correct Answer
    The op-amp’s external feedback network.
  • Supply voltage and slew rate.
  • The op-amp’s internal feedback network.
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Where is the external feedback network connected to control the gain of a closed-loop op-amp circuit?
  • Between the differential inputs.
  • From output to the non-inverting input.
  • Correct Answer
    From output to the inverting input.
  • Between the output and the differential inputs.
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Which of the following op-amp circuits is operated open-loop?
  • Non-inverting amp.er.
  • Inverting amp.
  • Active filt
  • Correct Answer
    Comparator.
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In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled?
  • Correct Answer
    Frequency would be lower.
  • Frequency would be higher.
  • There would be no change. The inputs are reversed, therefore the circuit cannot function.
  • None of the above.
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