What is the typical output impedance of an integrated circuit op-amp?

  1. Very low
  2. Very high
  3. 100 ohms
  4. 1000 ohms


What is the effect of ringing in a filter?

  1. An echo caused by a long time delay
  2. A reduction in high frequency response
  3. Partial cancellation of the signal over a range of frequencies
  4. Undesired oscillations added to the desired signal


What is the typical input impedance of an integrated circuit op-amp?

  1. 100 ohms
  2. 1000 ohms
  3. Very low
  4. Very high


What is meant by the term op-amp input offset voltage?

  1. The output voltage of the op-amp minus its input voltage
  2. The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
  3. The differential input voltage needed to bring the open loop output voltage to zero
  4. The potential between the amplifier input terminals of the op-amp in an open loop condition


How can unwanted ringing and audio instability be prevented in a multi-section op-amp RC audio filter circuit?

  1. Restrict both gain and Q
  2. Restrict gain but increase Q
  3. Restrict Q but increase gain
  4. Increase both gain and Q


Which of the following is the most appropriate use of an op-amp active filter?

  1. As a high-pass filter used to block RFI at the input to receivers
  2. As a low-pass filter used between a transmitter and a transmission line
  3. For smoothing power supply output
  4. As an audio filter in a receiver


What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?

  1. 0.21
  2. 94
  3. 47
  4. 24
Circuit Diagram


How does the gain of an ideal operational amplifier vary with frequency?

  1. It increases linearly with increasing frequency
  2. It decreases linearly with increasing frequency
  3. It decreases logarithmically with increasing frequency
  4. It does not vary with frequency


What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

  1. 0.23 volts
  2. 2.3 volts
  3. -0.23 volts
  4. -2.3 volts
Circuit Diagram


What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?

  1. 1
  2. 0.03
  3. 38
  4. 76
Circuit Diagram


What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms?

  1. 28
  2. 14
  3. 7
  4. 0.07
Circuit Diagram


What is an integrated circuit operational amplifier?

  1. A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance
  2. A digital audio amplifier whose characteristics are determined by components external to the amplifier
  3. An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
  4. A RF amplifier used in the UHF and microwave regions