Analog And Digital Converters MCQs
Practice and Learn through MCQs and Quizzes. W3Definitions.com have 21 Analog And Digital Converters MCQs
________ analog-to-digital converters (ADCs) have a fixed value of conversion time that is not dependent on the value of the analog input.
- A. Substandard
- B. Dual
- C. Recessive approximation
- D. Successive approximation
- Correct Answer: Option D
________ analog-to-digital converters (ADCs) use no clock signal, because there is no timing or sequencing required.
- A. Actuator
- B. Dual
- C. Flash
- D. Bipolar
- Correct Answer: Option C
A 4-bit R/2R digital-to-analog (DAC) converter has a reference of 5 volts. What is the analog output for the input code 0101.
- A. 0.3125 V
- B. 3.125 V
- C. 0.78125 V
- D. –3.125 V
- Correct Answer: Option B
A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 k. If 50 A of current is through the resistor, the voltage out of the circuit is:
- A. 0.6 V
- B. –0.6 V
- C. 0.1 V
- D. –0.1 V
- Correct Answer: Option B
A binary-weighted digital-to-analog converter has an input resistor of 100 k. If the resistor is connected to a 5 V source, the current through the resistor is:
- A. 50 A
- B. 5 mA
- C. 500 A
- D. 50 mA
- Correct Answer: Option A
A binary-weighted resistor used in a digital-to-analog converter (DAC) is only practical up to a resolution of ________.
- A. 10 bits
- B. 2 bits
- C. 8 bits
- D. 4 bits
- Correct Answer: Option D
A(n) ________ converts an analog input to a digital output.
- A. flash converter
- B. bipolar converter
- C. ADC
- D. DAC
- Correct Answer: Option C
In a flash analog-to-digital converter, the output of each comparator is connected to an input of a:
- A. decoder
- B. priority encoder
- C. multiplexer
- D. demultiplexer
- Correct Answer: Option B
Inaccurate analog-to-digital conversion may be due to ____________.
- A. constant analog input voltage
- B. linear ramp usage
- C. intermittent counter inputs
- D. faulty sample-and-hold circuitry
- Correct Answer: Option D
Sample-and-hold circuits in analog-to digital converters (ADCs) 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
- Correct Answer: Option C
The characteristic that a change of one binary step on the input of a digital-to-analog converter (DAC) should cause exactly one step change on the output is called ________.
- A. resolution
- B. monotonicity
- C. linearity
- D. accuracy
- Correct Answer: Option B
The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
- A. quantization
- B. accuracy
- C. resolution
- D. monotonicity
- Correct Answer: Option C
The number of binary bits at the input of a digital-to-analog converter (DAC) is known as ________.
- A. accuracy
- B. linearity
- C. resolution
- D. monotonicity
- Correct Answer: Option C
The practical use of binary-weighted digital-to-analog converters is limited to:
- A. R/2R ladder D/A converters
- B. 4-bit D/A converters
- C. 8-bit D/A converters
- D. op-amp comparators
- Correct Answer: Option B
The primary disadvantage of the flash analog-to digital converter (ADC) is that:
- A. it requires the input voltage to be applied to the inputs simultaneously
- B. a long conversion time is required
- C. a large number of output lines is required to simultaneously decode the input voltage
- D. a large number of comparators is required to represent a reasonable sized binary number
- Correct Answer: Option D
The problems of the binary-weighted resistor digital-to-analog converter (DAC) can be overcome by using ___________.
- A. an 8-bit binary-weighted resistor DAC
- B. an R/2R ladder DAC
- C. a staircase DAC
- D. a flash DAC
- Correct Answer: Option B
The resolution of a 0–5 V 6-bit digital-to-analog converter (DAC) is:
- A. 63%
- B. 64%
- C. 1.56%
- D. 15.6%
- Correct Answer: Option C
What is the major advantage of the R/2R ladder digital-to-analog (DAC), as compared to a binary-weighted digital-to-analog DAC converter?
- A. It only uses two different resistor values.
- B. It has fewer parts for the same number of inputs.
- C. Its operation is much easier to analyze.
- D. The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
- Correct Answer: Option A
What is the resolution of a digital-to-analog converter (DAC)?
- A. It is the comparison between the actual output of the converter and its expected output.
- B. It is the deviation between the ideal straight-line output and the actual output of the converter.
- C. It is the smallest analog output change that can occur as a result of an increment in the digital input.
- D. It is its ability to resolve between forward and reverse steps when sequenced over its entire range.
- Correct Answer: Option C
Which is not an analog-to-digital (ADC) conversion error?
- A. differential nonlinearity
- B. missing code
- C. incorrect code
- D. offset
- Correct Answer: Option A
Which of the following is a type of error associated with digital-to-analog converters (DACs)?
- A. nonmonotonic error
- B. incorrect output codes
- C. offset error
- D. nonmonotonic and offset error
- Correct Answer: Option D