Practice Analog And Digital Converters Multiple Choice Questions with Answers Quiz-1

Q.1.

The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:

quantization
accuracy
resolution
monotonicity

Q.2.

In a flash analog-to-digital converter, the output of each comparator is connected to an input of a:

decoder
priority encoder
multiplexer
demultiplexer

Q.3.

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

Q.4.

The primary disadvantage of the flash analog-to digital converter (ADC) is that:

it requires the input voltage to be applied to the inputs simultaneously
a long conversion time is required
a large number of output lines is required to simultaneously decode the input voltage
a large number of comparators is required to represent a reasonable sized binary number

Q.5.

Which is not an analog-to-digital (ADC) conversion error?

differential nonlinearity
missing code
incorrect code
offset

Q.6.

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

Q.7.

Sample-and-hold circuits in analog-to digital converters (ADCs) are designed to:

sample and hold the output of the binary counter during the conversion process
stabilize the comparator's threshold voltage during the conversion process
stabilize the input analog signal during the conversion process
sample and hold the D/A converter staircase waveform during the conversion process

Q.8.

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.

Q.9.

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.

Q.10.

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

Q.11.

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.

Q.12.

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

Q.13.

The resolution of a 0–5 V 6-bit digital-to-analog converter (DAC) is:

63%
64%
1.56%
15.6%

Q.14.

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 ________.

resolution
monotonicity
linearity
accuracy

Q.15.

________ analog-to-digital converters (ADCs) use no clock signal, because there is no timing or sequencing required.

Actuator
Dual
Flash
Bipolar

Q.16.

Inaccurate analog-to-digital conversion may be due to ____________.

constant analog input voltage
linear ramp usage
intermittent counter inputs
faulty sample-and-hold circuitry

Q.17.

________ analog-to-digital converters (ADCs) have a fixed value of conversion time that is not dependent on the value of the analog input.

Substandard
Dual
Recessive approximation
Successive approximation

Q.18.

A binary-weighted resistor used in a digital-to-analog converter (DAC) is only practical up to a resolution of ________.

10 bits
2 bits
8 bits
4 bits

Q.19.

The problems of the binary-weighted resistor digital-to-analog converter (DAC) can be overcome by using ___________.

an 8-bit binary-weighted resistor DAC
an R/2R ladder DAC
a staircase DAC
a flash DAC

Q.20.

The relative accuracy of a digital-to-analog converter (DAC) is determined by settling time.

True
False

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