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Home ‣ Digital Electronics ‣ Interfacing to the Analog World See What Others Are Saying!
  • Question

  • Which of the following describes the basic operation of a single-slope A/D converter.


  • Options
  • A. The input voltage is used to set the frequency of a voltage-controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading.
  • B. A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate.
  • C. A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter.
  • D. Any of the above could be correct, depending on the specific type of A/D converter involved.

  • Correct Answer
  • A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate. 

    • More questions

    • 1. On a positive edge-triggered S-R flip-flop, the outputs reflect the input condition when ________.

    • Options
    • A. the clock pulse is LOW
    • B. the clock pulse is HIGH
    • C. the clock pulse transitions from LOW to HIGH
    • D. the clock pulse transitions from HIGH to LOW
      • Discuss
    • 2. The inputs/outputs of an analog multiplexer/demultiplexer are:

    • Options
    • A. bidirectional
    • B. unidirectional
    • C. even parity
    • D. binary-coded decimal
      • Discuss
    • 3. The hexadecimal numbering system uses base 15.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The output voltage or current of a digital-to-analog converter is truly an analog signal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Shift registers are used to store and transfer data.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. To reduce the number of pins on high-capacity DRAM chips, address ________ is used so that a single pin can accommodate two different address bits.

    • Options
    • A. conversion
    • B. programming
    • C. multiplexing
    • D. firmware
      • Discuss
    • 7. The ________ number system has a base of sixteen.

    • Options
    • A. Johnson
    • B. hexadecimal
    • C. binary
    • D. octal
      • Discuss
    • 8. Using the CPLD design environment, we can simulate any combinations of inputs and observe the resulting output to check for proper circuit operation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In a parity generator circuit, an error is signaled on an error indicator.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The gated S-R flip-flop is asynchronous.

    • Options
    • A. True
    • B. False
      • Discuss

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