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Test: Data Converters - 1 - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test Topicwise Question Bank for Electronics Engineering - Test: Data Converters - 1

Test: Data Converters - 1 for Electronics and Communication Engineering (ECE) 2024 is part of Topicwise Question Bank for Electronics Engineering preparation. The Test: Data Converters - 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Data Converters - 1 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Data Converters - 1 below.
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Test: Data Converters - 1 - Question 1

The full-scale output of a digital to analog converter is 20 mA. If the resolution is 80µA, then the minimum number of bits required and percentage resolution are:

Detailed Solution for Test: Data Converters - 1 - Question 1

Concept:

The resolution for n bit DAC is given by:

The % resolution for n bit DAC is given by:

Calculation:

n = 8

% R = 0.39

Test: Data Converters - 1 - Question 2

An eight-bit D/A converter has a step size of 20 mV. The full-scale output voltage, in this case, would be -

Detailed Solution for Test: Data Converters - 1 - Question 2

The full scale output voltage of the given step size δ is:                             

Vfs = (2n−1) x δ where n is the number of bits

Now ,for question n = 8 and δ = 20 mV

Vfs = (28 − 1)×20×10−3

Vfs = 5.1 V

Test: Data Converters - 1 - Question 3

What is the resolution of a 0 - 5 V 8-bit DAC?

Detailed Solution for Test: Data Converters - 1 - Question 3

 

Concept:

The resolution of either a digital-to-analog converter (DAC) or an analog-to-digital converter (ADC) is the measure of how finely its output may change between discrete, binary steps.

For an n-bit DAC, the resolution (R) is measured by:

Vout = Output Voltage

n = number of bits

Calculation:

With Vout = 5 V, and n = 8 bits, the resolution will be:

Resolution = 0.0196

Test: Data Converters - 1 - Question 4

How many comparators would a 12-bit flash ADC require?

Detailed Solution for Test: Data Converters - 1 - Question 4

No of comparators required for n bit flash type ADC is (2- 1)

Given that, n = 12

No of comparators = 4095

Test: Data Converters - 1 - Question 5

The resolution of an 8 bit DAC will be:

Detailed Solution for Test: Data Converters - 1 - Question 5

Resolution: It is defined as the smallest change in the analog output voltage corresponding to a change of one bit in the digital output.

The percentage resolution (%R) of an n-bit DAC is:

The resolution of an n-bit DAC with a range of output voltage from 0 to V is given by:

Calculation:

Number of bits (n) = 8

Resolution = 

Test: Data Converters - 1 - Question 6

If the resolution of a digital-to-analog converter is approximately 0.4% of its full-scale range, then it is a/an _______.

Detailed Solution for Test: Data Converters - 1 - Question 6

Concept of Resolution: 

It is defined as the smallest change in the analog output voltage corresponding to a change of one bit in the digital output.

The percentage resolution (%R) of an n-bit DAC is:

Calculation:

As we know the formula resolution,

250 = 2N -1

2N = 251 ≈ 255 

i.e., 28 = 255

N = 8

Hence the minimum value of N satisfying the condition.

Test: Data Converters - 1 - Question 7

The resolution of 4 Bit counting ADC is 05 V For an analog input 5.8 volt the output of ADC will be_____

Detailed Solution for Test: Data Converters - 1 - Question 7

Concept:

  • Analog-to-Digital Converters (ADCs) transform an analog voltage to a binary number (a series of 1’s and 0’s).
  • Then eventually to a digital number (base 10) for reading on a meter, monitor, or chart.
  • The ADC resolution depends upon the number of bits used to represent the digit number. 
  • As the number of bits increases the resolution of an Analog to Digital Converter improves and the quantization error decreases.

Resolution for n – bit A/D converter  will be:

Where 

R = Resolution

VFS is reference voltage 'or' Full-scale voltage

n = number of bits

2ibi gives output voltage value.

Calculation:

Given:

VFS = 5.8 V

n = 4

R = 05 V

2ibi = 12.93 V ≈ 12 V

In bits, the output voltage will be 1100

Hence option (A) is the correct answer.

Test: Data Converters - 1 - Question 8

A D/A converter has 5V full-scale input voltage and an accuracy of ± 0.2%. The maximum error for any output voltage will be

Detailed Solution for Test: Data Converters - 1 - Question 8

Concept:

Maximum error (Er) of D/A is given as,

E= (VFS x Accuracy)

Where,

VFS: full-scale input voltage

Calculation:

Given: VfS = 5V , Accuracy= 0.2%

Er = 10 mV

Test: Data Converters - 1 - Question 9

Match List I with List II

Choose the correct answer from the options given below:

Detailed Solution for Test: Data Converters - 1 - Question 9

Counter type ADC:

  • Counter-type ADC is very simple to understand and also easy to operate.
  • Counter-type ADC design is less complex, so the cost is also less.
  • ·Speed is less, since each time the counter has to begin from ZERO.
  • There may be conflicts if the next input is sampled before the completion of one process.
  • In a Counter type ADC, the conversion time varies.
Test: Data Converters - 1 - Question 10

The present resolution of an 8-bit D/A converter is

Detailed Solution for Test: Data Converters - 1 - Question 10

Resolution: It is defined as the smallest change in the analog output voltage corresponding to a change of one bit in the digital output.

The percentage resolution (%R) of an n-bit DAC is:

The resolution of an n-bit DAC with a range of output voltage from 0 to V is given by:

Calculation:

Full scale output voltage (V) = 10 V

Number of bits (n) = 8

Resolution = 

%R = 1 / 255 × 100 = 0.392 %

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