Question 1

What type of op- amp circuit does not typically have a feedback path connected between its output and either of its input pins?

Accepted Answer

A)   A current multiplier
B)   An open- loop amplifier
C)   An inverter
D)   A comparatorE) A) and B)
F) B) and C)

Question 2

One disadvantage of the tracking A/D converter is ________.

Accepted Answer

A)   the need for an accurate clock reference for the counter
B)   the binary output will oscillate between two binary states when the analog input is constant
C)   the need for a latch and its associated control circuit
D)   it requires two counters: one for up and one for downE) B) and D)
F) A) and B)

Question 3

A digital- to- analog (D/A) converter changes data like temperature variations into digital quantities.

Accepted Answer

A) True 
 B)False

Question 4

The DSP, unlike the general- purpose microprocessor, must typically process data in real time; that is, as it happens.

Accepted Answer

A) True 
 B)False  True

Question 5

An analog- to- digital converter (ADC)  has a four- bit output. How many analog values can it represent?

Accepted Answer

A)   4
B)   0.0625
C)   1/4
D)   16E) A) and B)
F) A) and C)

Question 6

Quantization is performed by a(n)  D)  packets.

Accepted Answer

A)   DAC
B)   DSP
C)   ADC
D)   FilterE) A) and C)
F) All of the above C

Question 7

What advantage does the R/2R ladder DAC have over a binary- weighted- input DAC?

Accepted Answer

A)   The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
B)   It uses only two different resistor values.
C)   It is much easier to analyze its operation.
D)   It has fewer parts for the same number of inputs.E) None of the above
F) C) and D) B

Question 8

An analog quantity varies from 0- 7 V and is input to a 6- bit A/D converter. What analog value is represented by each step on the digital output?

Accepted Answer

A)   0.109 V
B)   0.111 V
C)   0.857 V
D)   1.17 VE) A) and B)
F) A) and C)

Question 9

The highest frequency component of the analog signal in an ADC is known as theD)  packets.

Accepted Answer

A)   Shannon frequency
B)   Nyquest frequency
C)   Aliasing frequency
D)   Sampling frequencyE) None of the above
F) B) and D)

Question 10

When the analog input to a tracking A/D converter is at a constant level, the digital output will oscillate.

Accepted Answer

A) True 
 B)False

Question 11

DSP applications include ________.

Accepted Answer

A)   telecommunications
B)   radar
C)   speech generation
D)   all of the aboveE) A) and C)
F) None of the above

Question 12

The main advantage that a tracking A/D converter has over a stairstep- ramp A/D converter is that it ________.

Accepted Answer

A)   uses an up/down counter to allow it to measure both positive and negative voltages
B)   is faster
C)   does not require a counter
D)   uses an up/down counter to indicate the polarity of the input voltageE) A) and B)
F) C) and D)

Question 13

Digital Signal Processing is the processing of analog signals by conversion to digital form.

Accepted Answer

A) True 
 B)False

Question 14

Refer to the figure below. What should the display on the scope look like if the A/D converter is working properly?

Accepted Answer

A)   The pattern should be a straight line across the screen due to the equal but opposite voltages being applied to the scope inputs.
B)   The scope should display a sequential binary count with the LSB being on the left and the MSB on the right side of the display.
C)   A uniform stairstep pattern should be displayed.
D)   It should be a circular Lissajous pattern resulting from the simultaneous application of ramps to the vertical and horizontal inputs of the oscilloscope.E) B) and C)
F) A) and D)

Question 15

Which of the equations below expresses the voltage gain relationship for an operational amplifier?

Accepted Answer

A)   Vout/Vin = - Rf/Rin
B)   Vin/Vout = Rout/Rin
C)   Vout = Vin/Av
D)   Vout/Vin = Rout/RinE) C) and D)
F) All of the above

Question 16

What is the main disadvantage of the stairstep- ramp A/D converter?

Accepted Answer

A)   It requires a precision clock in order for the conversion to be reliable.
B)   It requires a counter.
C)   The counter must count up from zero at the beginning of each conversion sequence, so the conversion time varies with the input voltage.
D)   All of the above are correct.E) B) and C)
F) A) and B)

Question 17

DSP applications include ________.

Accepted Answer

A)   image processing
B)   music processing
C)   filtering
D)   all of the aboveE) C) and D)
F) A) and D)

Question 18

The figure below represents a _________.

Accepted Answer

A)   tracking A/D converter
B)   successive- approximation A/D converter
C)   dual- approximation D/A comparator
D)   dual- slope A/D converterE) A) and B)
F) A) and C)

Question 19

Sigma- Delta ADC utilizes ________.

Accepted Answer

A)   a one- bit quantization method
B)   quantized difference between two samples
C)   delta modulation
D)   all of the aboveE) A) and D)
F) All of the above

Question 20

What function is performed by the block labeled 'X' in the figure below?

Accepted Answer

A)   Power supply for the audio amplifier
B)   Analog- to- digital conversion
C)   Audio ON/OFF control
D)   Digital- to- analog conversionE) C) and D)
F) A) and D)

Exam 12: Signal Conversion and Processing

What type of op- amp circuit does not typically have a feedback path connected between its output and either of its input pins?

Correct AnswerverifiedShow Answer

One disadvantage of the tracking A/D converter is ________.

Correct AnswerverifiedShow Answer

A digital- to- analog (D/A) converter changes data like temperature variations into digital quantities.

Correct AnswerverifiedShow Answer

The DSP, unlike the general- purpose microprocessor, must typically process data in real time; that is, as it happens.

Correct AnswerverifiedTrue

An analog- to- digital converter (ADC) has a four- bit output. How many analog values can it represent?

Correct AnswerverifiedShow Answer

Quantization is performed by a(n) D) packets.

Correct AnswerverifiedC

What advantage does the R/2R ladder DAC have over a binary- weighted- input DAC?

Correct AnswerverifiedB

An analog quantity varies from 0- 7 V and is input to a 6- bit A/D converter. What analog value is represented by each step on the digital output?

Correct AnswerverifiedShow Answer

The highest frequency component of the analog signal in an ADC is known as theD) packets.

Correct AnswerverifiedShow Answer

When the analog input to a tracking A/D converter is at a constant level, the digital output will oscillate.

Correct AnswerverifiedShow Answer

DSP applications include ________.

Correct AnswerverifiedShow Answer

The main advantage that a tracking A/D converter has over a stairstep- ramp A/D converter is that it ________.

Correct AnswerverifiedShow Answer

Digital Signal Processing is the processing of analog signals by conversion to digital form.

Correct AnswerverifiedShow Answer

Refer to the figure below. What should the display on the scope look like if the A/D converter is working properly?

Correct AnswerverifiedShow Answer

Which of the equations below expresses the voltage gain relationship for an operational amplifier?

Correct AnswerverifiedShow Answer

What is the main disadvantage of the stairstep- ramp A/D converter?

Correct AnswerverifiedShow Answer

DSP applications include ________.

Correct AnswerverifiedShow Answer

The figure below represents a _________.

Correct AnswerverifiedShow Answer

Sigma- Delta ADC utilizes ________.

Correct AnswerverifiedShow Answer

What function is performed by the block labeled 'X' in the figure below?

Correct AnswerverifiedShow Answer

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