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  • Question

  • The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin

    The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin = 3 MΩ, Zout = 80 Ω, and Aol = 250,000.


  • Options
  • A. 4.7 kΩ
  • B. 22.7 kΩ
  • C. 3 MΩ
  • D. 68.6 kΩ

  • Correct Answer
  • 4.7 kΩ 

    • Operational Amplifiers problems

    Search Results

    • 1. The voltage required to force the differential output to zero is called _______.

    • Options
    • A. input-offset current
    • B. input-offset voltage
    • C. input bias current
    • D. slew rate voltage
      • Discuss
    • 2. Current cannot flow to ground through a(n) ________.

    • Options
    • A. mechanical ground
    • B. ac ground
    • C. virtual ground
    • D. virtual short
      • Discuss
    • 3. Common-mode signals have _____.

    • Options
    • A. the same amplitude
    • B. the same phase
    • C. the same frequency
    • D. All of the above
      • Discuss
    • 4. ______ is NOT a characteristic of an ideal op-amp.

    • Options
    • A. Infinite voltage gain
    • B. Minimum bandwidth
    • C. Infinite input impedance
    • D. Zero output impedance
      • Discuss
    • 5. The Q of a crystal _________.

    • Options
    • A. is extremely low
    • B. is about 40 or so in most cases
    • C. is extremely high
    • D. none of the above
      • Discuss
    • 6. An op-amp circuit in which the output voltage is equal to the difference between the two input voltages is called a(n) _____

    • Options
    • A. integrator
    • B. differentiator
    • C. differential amplifier
    • D. voltage regulator
      • Discuss
    • 7. A virtual ground is a(n) ______ ground because this point is at zero volts.

    • Options
    • A. ordinary
    • B. voltage
    • C. chassis
    • D. earth
      • Discuss
    • 8. 

      The voltage gain is ______ for the amplifier in the given circuit.


    • Options
    • A. ?4
    • B. ?5
    • C. ?6
    • D. ?7
      • Discuss
    • 9. 

      The given circuit is ___.


    • Options
    • A. an inverting amplifier
    • B. a noninverting amplifier
    • C. a voltage follower
    • D. a differential amplifier
      • Discuss
    • 10. The resistors Rf and Ri in an op-amp circuit control ______ .

    • Options
    • A. positive feedback and current gain
    • B. negative feedback and power gain
    • C. negative feedback and voltage gain
    • D. open and closed loop gain
      • Discuss

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