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- Question
What is the conversion time of a flash converter?
Options- A. 20 µs
- B. 10 µs
- C. 1 µs
- D. The conversion takes place continuously.
- Correct Answer
- The conversion takes place continuously.
- 1. The quantization error in an analog-to-digital converter can be reduced by:
Options- A. increasing the number of bits in the counter and DAC.
- B. decreasing the number of bits in the counter and increasing the number of bits in the DAC.
- C. increasing the number of bits in the counter and decreasing the number of bits in the DAC.
- D. decreasing the number of bits in the counter and DAC. Discuss
- 2. The output of a basic 4-bit input digital-to-analog converter would be capable of outputting:
Options- A. 16 different values of voltage or current that are not proportional to the input binary number
- B. 16 different values of voltage or current that are proportional to the input binary number
- C. 32 different values of voltage or current that are not proportional to the input binary number
- D. 32 different values of voltage or current that are proportional to the input binary number Discuss
- 3. What is the major advantage of the R/2R ladder DAC as compared to a binary-weighted-input DAC?
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
- 4. Referring to the given figure, what appears to be wrong, if anything, with the D/A converter and what should be done to correct the problem?
Options- A. There is nothing wrong with the converter.
- B. There is an offset error; if no provision is made for adjusting the offset, the op-amp may need to be changed.
- C. There is a nonlinearity error; the op-amp must be changed.
- D. The power supply voltage appears to be too high; adjust the power supply to the correct value. Discuss
- 5. Which of the following characterizes an analog quantity?
Options- A. Discrete levels represent changes in a quantity.
- B. Its values follow a logarithmic response curve.
- C. It can be described with a finite number of steps.
- D. It has a continuous set of values over a given range. Discuss
- 6. A simultaneous A/D converter is also known as a(n) ________ A/D converter.
Options- A. flash
- B. synchronous
- C. comparator
- D. asynchronous Discuss
- 7. What is the resolution, in percent, of a 12-bit DAC?
Options- A. 8.33
- B. 0.049
- C. 0.000488
- D. 0.083 Discuss
- 8. An analog quantity varies from 0?7 V and is input to a 6-bit A/D converter. What analog value is represented by each step on the digital output?
Options- A. 0.111 V
- B. 1.17 V
- C. 0.109 V
- D. 0.857 V Discuss
- 9. What is the disadvantage to using a counter-ramp type ADC?
Options- A. complex circuit
- B. high cost
- C. very slow Discuss
- 10. What is the linearity 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
Interfacing to the Analog World problems
Search Results
Correct Answer: increasing the number of bits in the counter and DAC.
Correct Answer: 16 different values of voltage or current that are proportional to the input binary number
Correct Answer: It uses only two different resistor values.
Correct Answer: There is an offset error; if no provision is made for adjusting the offset, the op-amp may need to be changed.
Correct Answer: It has a continuous set of values over a given range.
Correct Answer: flash
Correct Answer: 0.049
Correct Answer: 0.111 V
Correct Answer: very slow
Correct Answer: It is the deviation between the ideal straight-line output and the actual output of the converter.
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