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Analog and Digital Converters problems


  • 1. The resolution of a 0?5 V 6-bit digital-to-analog converter (DAC) is:

  • Options
  • A. 63%
  • B. 64%
  • C. 1.56%
  • D. 15.6%
  • Discuss
  • 2. The primary disadvantage of the flash analog-to digital converter (ADC) is that:

  • Options
  • A. it requires the input voltage to be applied to the inputs simultaneously
  • B. a long conversion time is required
  • C. a large number of output lines is required to simultaneously decode the input voltage
  • D. a large number of comparators is required to represent a reasonable sized binary number
  • Discuss
  • 3. Which of the following is a type of error associated with digital-to-analog converters (DACs)?

  • Options
  • A. nonmonotonic error
  • B. incorrect output codes
  • C. offset error
  • D. nonmonotonic and offset error
  • Discuss
  • 4. A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 kΩ. If 50 µA of current is through the resistor, the voltage out of the circuit is:

  • Options
  • A. 0.6 V
  • B. ?0.6 V
  • C. 0.1 V
  • D. ?0.1 V
  • Discuss
  • 5. A binary-weighted digital-to-analog converter has an input resistor of 100 kΩ. If the resistor is connected to a 5 V source, the current through the resistor is:

  • Options
  • A. 50 µA
  • B. 5 mA
  • C. 500 µA
  • D. 50 mA
  • Discuss
  • 6. A 4-bit R/2R digital-to-analog (DAC) converter has a reference of 5 volts. What is the analog output for the input code 0101.

  • Options
  • A. 0.3125 V
  • B. 3.125 V
  • C. 0.78125 V
  • D. ?3.125 V
  • Discuss
  • 7. The practical use of binary-weighted digital-to-analog converters is limited to:

  • Options
  • A. R/2R ladder D/A converters
  • B. 4-bit D/A converters
  • C. 8-bit D/A converters
  • D. op-amp comparators
  • Discuss
  • 8. The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:

  • Options
  • A. quantization
  • B. accuracy
  • C. resolution
  • D. monotonicity
  • Discuss
  • 9. What is the resolution of a digital-to-analog converter (DAC)?

  • Options
  • A. It is the comparison between the actual output of the converter and its expected output.
  • B. It is the deviation between the ideal straight-line output and the actual output of the converter.
  • C. It is the smallest analog output change that can occur as a result of an increment in the digital input.
  • D. It is its ability to resolve between forward and reverse steps when sequenced over its entire range.
  • Discuss
  • 10. What is the major advantage of the R/2R ladder digital-to-analog (DAC), as compared to a binary-weighted digital-to-analog DAC converter?

  • Options
  • A. It only uses two different resistor values.
  • B. It has fewer parts for the same number of inputs.
  • C. Its operation is much easier to analyze.
  • D. The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
  • Discuss

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