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  • Question

  • Refer to Figure 20-2. This circuit is a setup for an antilog amplifier a constant-current source an
    Refer to Figure 20-2. This circuit is a setup for


  • Options
  • A. an antilog amplifier
  • B. a constant-current source
  • C. an instrumentation amplifier
  • D. an isolation amplifier

  • Correct Answer
  • a constant-current source 

    • Special-Purpose Op-Amp Circuits problems

    Search Results

    • 1. The voltage gain of an OTA can be calculated using the formula

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. The signal voltage gain of an amplifier, Av, is defined as:

    • Options
    • A.
    • B. Av = IC × RC
    • C.
    • D.
      • Discuss
    • 3. Which of the following conditions are needed to properly bias an npn transistor amplifier?

    • Options
    • A. Forward bias the base/emitter junction and reverse bias the base/collector junction.
    • B. Forward bias the collector/base junction and reverse bias the emitter/base junction.
    • C. Apply a positive voltage on the n-type material and a negative voltage on the p-type material.
    • D. Apply a large voltage on the base.
      • Discuss
    • 4. The formula used to calculate the approximate ac resistance of the base-emitter diode (re) is

    • Options
    • A.
    • B. re ≈ 25 mV × IC
    • C.
    • D.
      • Discuss
    • 5. The primary function of the bias circuit is to

    • Options
    • A. hold the circuit stable at VCC
    • B. hold the circuit stable at vin
    • C. ensure proper gain is achieved
    • D. hold the circuit stable at the designed Q-point
      • Discuss
    • 6. 

      Which circuit is known as a current-to-voltage converter?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 7. In the classic three-op-amp instrumentation amplifier, the differential voltage gain is usually produced by the

    • Options
    • A. first stage
    • B. second stage
    • C. mismatched resistors
    • D. output op-amp
      • Discuss
    • 8. Circuits that shift the dc level of a signal are called

    • Options
    • A. limiters
    • B. clampers
    • C. peak detectors
    • D. dc converters
      • Discuss
    • 9. An instrumentation amplifier has a high

    • Options
    • A. output impedance
    • B. power gain
    • C. CMRR
    • D. supply voltage
      • Discuss
    • 10. The primary function of the oscillator in an isolation amplifier is to

    • Options
    • A. convert dc to high-frequency ac
    • B. convert dc to low-frequency ac
    • C. rectify high-frequency ac to dc
    • D. produce dual-polarity dc voltages for the input to the demodulator
      • Discuss

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