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
0 h : 0 m : 1 s