Interfacing to the Analog World Questions and Answers

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Q41
Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.
  • A very high voltage gain
  • B unlimited bandwidth
  • C a low slew rate
  • D very high current gain
Answer: Option A
Q42
Sample-and-hold circuits in A/D converters are designed to:
  • 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
Answer: Option C
Q43
What is the main disadvantage of the counter-ramp A/D converter?
  • 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.
Answer: Option B
Q44
Why is a binary-weighted DAC usually limited to 4-bit binary conversion?
  • 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
Answer: Option D
Q45
What is the resolution of a D/A converter?
  • 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 deviation between the ideal straight-line output and the actual output of the converter.
  • D It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.
Answer: Option A
Q46
An actuator is usually a device that:
  • 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.
Answer: Option B
Q47
The DAC0808 and the MC1408 are very popular and inexpensive 8-bit D/A converters.
  • A TRUE
  • B FALSE
Answer: Option A
Q48
The delay between a change on the digital input of a DAC and the appearance of the change on the output is called settling time.
  • A TRUE
  • B FALSE
Answer: Option A
Q49
The main advantage of the SAR ADC method is its high speed.
  • A TRUE
  • B FALSE
Answer: Option A
Q50
One way to determine the resolution of a DAC is to calculate the ratio of one step voltage to the maximum output voltage.
  • A TRUE
  • B FALSE
Answer: Option A

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