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Home ‣ Digital Electronics ‣ Interfacing to the Analog World Comments
  • Question

  • One disadvantage of the tracking A/D converter is:


  • Options
  • A. that it requires two counters?one for up and one for down.
  • B. that the binary output will oscillate between two binary states when the analog input is constant.
  • C. the need for an accurate clock reference for the counter.
  • D. the need for a latch and its associated control circuit.

  • Correct Answer
  • that the binary output will oscillate between two binary states when the analog input is constant. 

    • Interfacing to the Analog World problems

    Search Results

    • 1. What is the main disadvantage of the stairstep-ramp A/D converter?

    • Options
    • A. The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
    • B. It requires a counter.
    • C. It requires a precision clock in order for the conversion to be reliable.
    • D. All of the above
      • Discuss
    • 2. One major difference between a counter-ramp A/D converter and a successive-approximation converter is:

    • Options
    • A. the counter-ramp A/D converter is much faster than the successive-approximation converter
    • B. with the successive-approximation converter the final binary result is always slightly less than the equivalent analog input, whereas with the counter-ramp A/D converter it is slightly more
    • C. with the successive-approximation converter the final binary result is always slightly more than the equivalent analog input, whereas with the counter-ramp A/D converter it is slightly less
    • D. none of the above
      • Discuss
    • 3. A 4-bit stairstep-ramp A/D converter has a clock frequency of 100 kHz and maximum input voltage of 10 V.

    • Options
    • A. The maximum number of samples per second will be 6250.
    • B. The maximum sample rate will be 100,000 samples/second.
    • C. The minimum sample rate will be 6250 samples/second.
    • D. The minimum sample rate will be 100,000 samples/second.
      • Discuss
    • 4. What is the output voltage of the given circuit if the inputs are as follows:
      20 = 1, 21 = 1, 22 = 0, 23 = 0?


    • Options
    • A. ?3.115 volts
    • B. ?2.8025 volts
    • C. ?1.875 volts
    • D. ?1.24 volts
      • Discuss
    • 5. Two principal advantages of the dual-slope ADC are its:

    • Options
    • A. high speed and low cost.
    • B. high sensitivity to noise and low cost.
    • C. low sensitivity to noise and high speed.
    • D. low sensitivity to noise and low cost.
      • Discuss
    • 6. What is the current in the feedback resistor for the circuit given below?


    • Options
    • A. 0.625 mA
    • B. 1.25 mA
    • C. 1.875 mA
    • D. 1.625 mA
      • Discuss
    • 7. What is the main disadvantage of the counter-ramp A/D converter?

    • Options
    • A. It requires a counter.
    • B. The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
    • C. It requires a precision clock in order for the conversion to be reliable.
    • D. The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage. It requires a precision clock in order for the conversion to be reliable.
      • Discuss
    • 8. What is the accuracy of a D/A converter?

    • Options
    • A. It is the reciprocal of the number of discrete steps in the D/A output.
    • B. It is the comparison between the actual output of the converter and its expected output.
    • C. It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.
    • D. It is the deviation between the ideal straight-line output and the actual output of the converter.
      • Discuss
    • 9. What is the major advantage of the R/2R ladder D/A converter as compared to a binary-weighted D/A converter?

    • Options
    • A. It has fewer parts for the same number of inputs.
    • B. It is much easier to analyze its operation.
    • C. It uses only two different resistor values.
    • D. The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
      • Discuss
    • 10. An analog-to-digital converter has a four-bit output. How many analog values can it represent?

    • Options
    • A. 4
    • B. 1/4
    • C. 16
    • D. 0.0625
      • Discuss

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