Electronics and Communication Engineering (ECE) > Topicwise Question Bank for Electronics Engineering > Test: Data Converters - 2

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

**Flash ADC is also known as parallel comparative A/D converter**

1) Flash ADC - Faster speed and low noise immunity

2) SAC ADC - Low noise immunity and medium speed

3) RAMP ADC - Higher resolution and good noise immunity

4) Dual Slope ADC - Low speed and good noise immunity

For n-bit conversion, the conversion time for different ADC are:

Counter type ADC: (2^{n} – 1) Tclk

Successive approx. time ADC: n Tclk

Flash type ADC: T_{clk}

Dual slope ADC: (2^{n}+1 – 1) Tclk **(Maximum time is taken)**

Test: Data Converters - 2 - Question 2

The minimum number of comparators required to build an 8 bit flash ADC

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

**Concept:**

Flash Type ADC:

1) It is the fastest ADC among all the ADC types.

2) An n-bit flash type ADC requires:

2^{n} -1 comparators, 2n resistors and one 2^{n} × n priority encoder.

**Calculation:**

The number of comparators required to build an 8-bit flash ADC will be:

N = 2^{8} - 1

N = 256 - 1

N = 255

Test: Data Converters - 2 - Question 3

The difference between analog voltage represented by two adjacent digital codes of an analog to digital converter is

Detailed Solution for Test: Data Converters - 2 - Question 3

**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:

Hence the difference between analog voltage represented by* *two adjacent digital codes of an analog to digital converter is called **resolution.**

**Hence option (B) is the correct answer.**

Test: Data Converters - 2 - Question 4

Maximum value of signal to noise ratio of an 8 bit ADC with an I/P range of 10 V will be

Detailed Solution for Test: Data Converters - 2 - Question 4

**Concept:**

For an n-bit ADC signal to noise ratio is given by

= 1.8 + 6 n dB

Where message signal → sinusoidal & noise PDF = uniform distribution

**Calculation:**

Given data n = 8 bit

Signal to noise ratio (SNR) = 1.8 + 6 n dB

= 1.8 + 6 x 8

= 49.8 dB

Test: Data Converters - 2 - Question 5

An analog voltage in the range 0 to 5V is divided into 10 equal intervals for conversion into 4 bit digital output. The maximum quantization error (in V) is -

Detailed Solution for Test: Data Converters - 2 - Question 5

**Concept:**

Maximum Quantization error =

Step size= (V_{max} - V_{min})

**Calculation:**

Given

Analog voltage ranging from 0 V (V_{min}) to 5 V (V_{max})

No. of interval or number of steps = 10

Step size = (5 - 0) = 5 V

Maximum quantization error = 1/2 × (5/10) =** 0.25 V**

Detailed Solution for Test: Data Converters - 2 - Question 6

The Digital to analog converter takes the binary number as an input and produces the analog voltage proportional to the binary number. These analog voltages represent specific analog voltage levels and have stairstep characters.

Test: Data Converters - 2 - Question 7

What is the error that occurs when the number of bits is not sufficient enough to represent the analog voltages?

Detailed Solution for Test: Data Converters - 2 - Question 7

When the number of bits is not sufficient enough to represent the analog voltage levels, quantization error occurs. The greater the number of bits, the greater the number of increments over the analog range and the smaller the quantizing error.

Test: Data Converters - 2 - Question 8

What is the minimum frequency of sampling so that the analog waveform is adequately expressed?

Detailed Solution for Test: Data Converters - 2 - Question 8

The minimum frequency at which an analog wave should be sampled is given by Nyquist frequency. If the sampling frequency is below this limit then the analog waveform is not fully represented and leads to data loss.

Detailed Solution for Test: Data Converters - 2 - Question 9

ADC corresponds to Analog to Digital Converter which is used to convert an analog signal into a digital. Digital signal can be processed and manipulated.

Test: Data Converters - 2 - Question 10

What is the signal frequency if the rectangular digital wave has a time period of 71.4μs?

Detailed Solution for Test: Data Converters - 2 - Question 10

Signal frequency = 1/ time period of the wave = 1/71.4μs = 14,006Hz.

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