Analog and Digital Converts Questions and Answers
Analog and Digital Converts questions with answers test understanding of how continuous signals are converted into discrete digital data. These aptitude questions and answers with explanations are key for exams like GATE, ISRO, and ECIL. The topic covers ADCs (Analog-to-Digital Converters) and DACs (Digital-to-Analog Converters), their working principles, and accuracy parameters. Mastering this helps students grasp signal processing fundamentals, making it easier to tackle both theoretical and numerical problems in electronics aptitude and placement tests.
Study the methods of analog to digital signal conversion. Complement this with analogies and analog-to-digital conversion
Analog and Digital Converts
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22 questions
1. Which of the following is a type of error associated with digital-to-analog converters (DACs)?
- nonmonotonic error
- incorrect output codes
- offset error
- nonmonotonic and offset error
2. 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.
- 0.3125 V
- 3.125 V
- 0.78125 V
- –3.125 V
3. A binary-weighted digital-to-analog converter has an input resistor of 100 komega.gif. If the resistor is connected to a 5 V source, the current through the resistor is:
- 50 mu.gifA
- 5 mA
- 500 mu.gifA
- 50 mA
4. What is the resolution of a digital-to-analog converter (DAC)?
- It is the comparison between the actual output of the converter and its expected output.
- It is the deviation between the ideal straight-line output and the actual output of the converter.
- It is the smallest analog output change that can occur as a result of an increment in the digital input.
- It is its ability to resolve between forward and reverse steps when sequenced over its entire range.
5. The practical use of binary-weighted digital-to-analog converters is limited to:
- R/2R ladder D/A converters
- 4-bit D/A converters
- 8-bit D/A converters
- op-amp comparators
6. The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
- quantization
- accuracy
- resolution
- monotonicity
7. A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 komega.gif. If 50 mu.gifA of current is through the resistor, the voltage out of the circuit is:
- 0.6 V
- –0.6 V
- 0.1 V
- –0.1 V
8. 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?
- It only uses two different resistor values.
- It has fewer parts for the same number of inputs.
- Its operation is much easier to analyze.
- The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
9. The resolution of a 0–5 V 6-bit digital-to-analog converter (DAC) is:
- 63%
- 64%
- 1.56%
- 15.6%
10. In a flash analog-to-digital converter, the output of each comparator is connected to an input of a:
- decoder
- priority encoder
- multiplexer
- demultiplexer