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