Question 1

The primary disadvantage of the flash A/D converter is the large number of comparators required.

Accepted Answer

A) True 
 B)False

Question 2

Usually an analog signal does not require filtering before DSP occurs.

Accepted Answer

A) True 
 B)False

Question 3

Refer to the figure below. What, if anything, appears to be wrong with the output of the D/A converter?

Accepted Answer

A)  It appears that certain input codes are incorrect; double- check the input coding. 
B)  There appears to be some nonlinearity in the scope display. 
C)  The converter has a nonmonotonic output error. 
D)  The input signal is probably noisy. 
A)  It appears that certain input codes are incorrect; double- check the input coding. 
B)  There appears to be some nonlinearity in the scope display. 
C)  The converter has a nonmonotonic output error. 
D)  The input signal is probably noisy.

Question 4

‪  
-The circuit shown in Figure 12- 1 is a(n) ________.

Accepted Answer

A)  R/2R ladder D/A converter 
B)  binary- weighted- input DAC 
C)  four- bit decoder 
D)  four- bit A/D converter 
A)  R/2R ladder D/A converter 
B)  binary- weighted- input DAC 
C)  four- bit decoder 
D)  four- bit A/D converter

Question 5

The primary disadvantage of the simultaneous A/D converter is _________.

Accepted Answer

A)  the long conversion time required 
B)  the large number of output lines required to simultaneously decode the input voltage 
C)  the large number of comparators required to represent a reasonable- sized binary number 
D)  that it requires the input voltage to be applied to the inputs simultaneously 
A)  the long conversion time required 
B)  the large number of output lines required to simultaneously decode the input voltage 
C)  the large number of comparators required to represent a reasonable- sized binary number 
D)  that it requires the input voltage to be applied to the inputs simultaneously

Question 6

The typical DSP does not have a CPU like a general- purpose microprocessor does.

Accepted Answer

A) True 
 B)False

Question 7

What is the resolution, in percent, of a 12- bit DAC?

Accepted Answer

A)  0.024 
B)  0.000488 
C)  0.083 
D)  8.33 
A)  0.024 
B)  0.000488 
C)  0.083 
D)  8.33

Question 8

A simultaneous A/D converter is also known as a/an ________A/D converter.

Accepted Answer

A)  asynchronous 
B)  flash 
C)  synchronous 
D)  comparator 
A)  asynchronous 
B)  flash 
C)  synchronous 
D)  comparator

Question 9

What operation can a DSP perform on incoming data?

Accepted Answer

A)  reduce the amplitude of selected frequencies 
B)  correct errors 
C)  encode the data 
D)  all the above 
A)  reduce the amplitude of selected frequencies 
B)  correct errors 
C)  encode the data 
D)  all the above

Question 10

After DSP, a digital signal can be converted back to a much- improved version of the original analog signal.

Accepted Answer

A) True 
 B)False

Question 11

The basic approach to testing D/A converters is to ________.

Accepted Answer

A)  apply a sequence of binary codes covering the full range of the input to the input while observing the output on an oscilloscope. The output should consist of a linear stairstep ramp 
B)  single- step the device through its full input range while checking the output with a DMM 
C)  apply the correct input to the analog terminal and then check to see if the proper binary code exists on the digital inputs 
D)  check the output with zero input and then full input. The output of the converter should extend from zero to its maximum value. If so, then everything in between can be assumed to be operating properly 
A)  apply a sequence of binary codes covering the full range of the input to the input while observing the output on an oscilloscope. The output should consist of a linear stairstep ramp 
B)  single- step the device through its full input range while checking the output with a DMM 
C)  apply the correct input to the analog terminal and then check to see if the proper binary code exists on the digital inputs 
D)  check the output with zero input and then full input. The output of the converter should extend from zero to its maximum value. If so, then everything in between can be assumed to be operating properly

Question 12

Which of the statements below best describes the basic operation of a dual- slope A/D converter?

Accepted Answer

A)  The input voltage is used to set the frequency of a voltage- controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading. 
B)  A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter. 
C)  A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate. 
D)  Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches. 
A)  The input voltage is used to set the frequency of a voltage- controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading. 
B)  A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter. 
C)  A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate. 
D)  Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches.

Question 13

Which of the following describes the basic operation of a single- slope A/D converter?

Accepted Answer

A)  A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate. 
B)  A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter. 
C)  The input voltage is used to set the frequency of a voltage- controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading. 
D)  Any of the above could be correct, depending on the specific type of A/D converter involved. 
A)  A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate. 
B)  A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter. 
C)  The input voltage is used to set the frequency of a voltage- controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading. 
D)  Any of the above could be correct, depending on the specific type of A/D converter involved.

Question 14

DSPs are programmed in ________.

Accepted Answer

A)  assembly language 
B)  ABEL 
C)  visual basic 
D)  none of the above 
A)  assembly language 
B)  ABEL 
C)  visual basic 
D)  none of the above

Question 15

An eight- bit D/A converter has a resolution of 0.125.

Accepted Answer

A) True 
 B)False

Question 16

What is the accuracy of a D/A converter?

Accepted Answer

A)  It is the ability to resolve between forward and reverse steps when sequenced over its entire range of inputs. 
B)  It is the deviation between the ideal straight- line output and the actual output of the converter. 
C)  It is the reciprocal of the number of discrete steps in the D/A output. 
D)  It is the comparison between the actual output of the converter and its expected output. 
A)  It is the ability to resolve between forward and reverse steps when sequenced over its entire range of inputs. 
B)  It is the deviation between the ideal straight- line output and the actual output of the converter. 
C)  It is the reciprocal of the number of discrete steps in the D/A output. 
D)  It is the comparison between the actual output of the converter and its expected output.

Question 17

‪  
-What is the output from the circuit in Figure 12- 1 at the time marked 'X'?

Accepted Answer

A)  2.75 V 
B)  1.011 V 
C)  - 1.011 V 
D)  - 2.75 V 
A)  2.75 V 
B)  1.011 V 
C)  - 1.011 V 
D)  - 2.75 V

Question 18

An operational amplifier can be used as a comparator.

Accepted Answer

A) True 
 B)False

Question 19

What is the resolution of a D/A converter?

Accepted Answer

A)  It is the deviation between the ideal straight- line output and the actual output of the converter. 
B)  It is the reciprocal of the number of discrete steps in the D/A output. 
C)  It is the comparison between the actual output of the converter and its expected output. 
D)  The ability to resolve between forward and reverse steps when sequenced over its entire range of inputs. 
A)  It is the deviation between the ideal straight- line output and the actual output of the converter. 
B)  It is the reciprocal of the number of discrete steps in the D/A output. 
C)  It is the comparison between the actual output of the converter and its expected output. 
D)  The ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.

Question 20

The process preformed by an ADC is called quantization.

Accepted Answer

A) True 
 B)False

The primary disadvantage of the flash A/D converter is the large number of comparators required.

Usually an analog signal does not require filtering before DSP occurs.

Refer to the figure below. What, if anything, appears to be wrong with the output of the D/A converter?

‪ -The circuit shown in Figure 12- 1 is a(n) ________.

The primary disadvantage of the simultaneous A/D converter is _________.

The typical DSP does not have a CPU like a general- purpose microprocessor does.

What is the resolution, in percent, of a 12- bit DAC?

A simultaneous A/D converter is also known as a/an ________A/D converter.

What operation can a DSP perform on incoming data?

After DSP, a digital signal can be converted back to a much- improved version of the original analog signal.

The basic approach to testing D/A converters is to ________.

Which of the statements below best describes the basic operation of a dual- slope A/D converter?

Which of the following describes the basic operation of a single- slope A/D converter?

DSPs are programmed in ________.

An eight- bit D/A converter has a resolution of 0.125.

What is the accuracy of a D/A converter?

‪ -What is the output from the circuit in Figure 12- 1 at the time marked 'X'?

An operational amplifier can be used as a comparator.

What is the resolution of a D/A converter?

The process preformed by an ADC is called quantization.

Introductory Concepts

Number Systems, Operations, and Codes

Logic Gates

Boolean Algebra and Logic Simplification

Combinational Logic Analysis

Functions of Combinational Logic

Latches, Flip-Flops, and Timers

Shift Registers

Counters

Programmable Logic

Data Storage

Data Transmission

Data Processing and Control

Integrated Circuit Technologies

Filters

Exam 12: Signal Conversion and Processing

The primary disadvantage of the flash A/D converter is the large number of comparators required.

Usually an analog signal does not require filtering before DSP occurs.

Refer to the figure below. What, if anything, appears to be wrong with the output of the D/A converter?

‪ -The circuit shown in Figure 12- 1 is a(n) ________.

The primary disadvantage of the simultaneous A/D converter is _________.

The typical DSP does not have a CPU like a general- purpose microprocessor does.

What is the resolution, in percent, of a 12- bit DAC?

A simultaneous A/D converter is also known as a/an ________A/D converter.

What operation can a DSP perform on incoming data?

After DSP, a digital signal can be converted back to a much- improved version of the original analog signal.

The basic approach to testing D/A converters is to ________.

Which of the statements below best describes the basic operation of a dual- slope A/D converter?

Which of the following describes the basic operation of a single- slope A/D converter?

DSPs are programmed in ________.

An eight- bit D/A converter has a resolution of 0.125.

What is the accuracy of a D/A converter?

‪ -What is the output from the circuit in Figure 12- 1 at the time marked 'X'?

An operational amplifier can be used as a comparator.

What is the resolution of a D/A converter?

The process preformed by an ADC is called quantization.

Introductory Concepts

Number Systems, Operations, and Codes

Logic Gates

Boolean Algebra and Logic Simplification

Combinational Logic Analysis

Functions of Combinational Logic

Latches, Flip-Flops, and Timers

Shift Registers

Counters

Programmable Logic

Data Storage

Data Transmission

Data Processing and Control

Integrated Circuit Technologies

Filters