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- Question
Sample-and-hold circuits in A/D converters are designed to:
Options- A. sample and hold the output of the binary counter during the conversion process
- B. stabilize the comparator's threshold voltage during the conversion process
- C. stabilize the input analog signal during the conversion process
- D. sample and hold the D/A converter staircase waveform during the conversion process
- Correct Answer
- stabilize the input analog signal during the conversion process
- 1. An actuator is usually a device that:
Options- A. converts analog data to meaningful digital data.
- B. controls a physical variable.
- C. stores digital data and then processes that data according to a set of specified instructions.
- D. converts a physical variable to an electrical variable. Discuss
- 2. What is the current in R1 and the current in R2 for the circuit shown below?
Options- A. I1 = 0.416 mA, I2 = 0.416 mA
- B. I1 = 0.357 mA, I2 = 0.357 mA
- C. I1 = 1.25 mA, I2 = 0.625 mA
- D. I1 = 0.625 mA, I2 = 1.25 mA Discuss
- 3. What is the resolution of a D/A converter?
Options- A. the comparison between the actual output of the converter and its expected output
- B. the reciprocal of the number of discrete steps in the D/A output
- C. the deviation between the ideal straight-line output and the actual output of the converter
- D. the ability to resolve between forward and reverse steps when sequenced over its entire range Discuss
- 4. The process by which a computer acquires digitized analog data is referred to as ________.
Options- A. data acquisition
- B. monotonicity
- C. analog resolution
- D. systematic digital conversion Discuss
- 5. If the same analog signal is to be converted to an 8-bit resolution using a counter-ramp ADC, how many comparator circuits would be used?
Options- A. 1
- B. 8
- C. 127
- D. 255 Discuss
- 6. The main advantage of the successive-approximation A/D converter over the counter-ramp A/D converter is its:
Options- A. more complex circuitry
- B. less complex circuitry
- C. longer conversion time
- D. shorter conversion time Discuss
- 7. What circuitry is on an ADC0808 IC?
Options- A. A multiplexer
- B. An ADC
- C. A 3-bit select input code
- D. All of the above Discuss
- 8. 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
- 9. What is the purpose of a sample-and-hold circuit?
Options- A. To keep temporary memory
- B. To hold a voltage constant so an ADC has time to produce an output
- C. To hold a voltage constant so a DAC has time to produce an output
- D. To hold data after a multiplexer has selected an output Discuss
- 10. Why is a binary-weighted DAC usually limited to 4-bit binary conversion?
Options- A. too many pins on the IC
- B. too many op amps needed
- C. too many different values of capacitors
- D. too many different values of resistors Discuss
Interfacing to the Analog World problems
Search Results
Correct Answer: controls a physical variable.
Correct Answer: I1 = 0.625 mA, I2 = 1.25 mA
Correct Answer: the reciprocal of the number of discrete steps in the D/A output
Correct Answer: data acquisition
Correct Answer: 1
Correct Answer: shorter conversion time
Correct Answer: All of the above
Correct Answer: 4-bit D/A converters
Correct Answer: To hold a voltage constant so an ADC has time to produce an output
Correct Answer: too many different values of resistors
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