Digital Signal Processing

Q1: Which of the following best defines Nyquist frequency?

A
The frequency of resonance for the filtering circuit

B
The second harmonic

C
The lower frequency limit of sampling

D
The highest frequency component of a given analog signal

Q2: In a digital reproduction of an analog curve, accuracy can be increased by ________.

A
sampling the curve more often

B
sampling the curve less often

C
decreasing the number of bits used to represent each sampled value

D
all of the above

Q3: The resolution of a 6-bit DAC is ________.

A
63%

B
64%

C
15.9%

D
1.59%

Q4: In a digital representation of voltages using an 8-bit binary code, how many values can be defined?

A
16

B
64

C
128

D
256

Q5: In troubleshooting a DAC, we check its performance characteristics, such as ________.

A
nonmonotonicity

B
differential nonlinearity

C
low and high gain

D
all of the above

Q6: In a flash analog-to-digital converter, the output of each comparator is connected to an input of a ________.

A
decoder

B
priority encoder

C
multiplexer

D
demultiplexer

Q7: Which A/D conversion method has a fixed conversion time?

A
Single-slope analog-to-digital converter

B
Dual-slope analog-to-digital converter

C
Digital-ramp analog-to-digital converter

D
Successive-approximation analog-to-digital converter

Q8: The ADC0804 is an example of a ________.

A
single-slope analog-to-digital converter

B
dual-slope analog-to-digital converter

C
digital-ramp analog-to-digital converter

D
successive-approximation analog-to-digital converter

Q9: If a DAC has a full-scale, or maximum, output of 12 V and accuracy of 0.1%, then the maximum error for any output voltage is ________.

A
12 V

B
120 mV

C
12 mV

D
0 V

Q10: Which type of programming is typically used for digital signal processors?

A
Assembly language

B
Machine language

C
C

D
None of the above

Q11: A binary-weighted-input digital-to-analog converter has a feedback resistor, Rf, of 12 k. If 50 A of current is through the resistor, voltage out of the circuit is ________.

A
0.6 V

B
–0.6 V

C
0.1 V

D
–0.1 V

Q12: Settling time is normally defined as the time it takes a DAC to settle within ________.

A
1/8 LSB of its final value when a change occurs in the input code

B
1/4 LSB of its final value when a change occurs in the input code

C
1/2 LSB of its final value when a change occurs in the input code

D
1 LSB of its final value when a change occurs in the input code

Q13: The dual-slope analog-to-digital converter finds extensive use in ________.

A
digital voltmeters

B
function generators

C
frequency counters

D
all of the above

Q14: Which is not an A/D conversion error?

A
Differential nonlinearity

B
Missing code

C
Incorrect code

D
Offset

Q15: For a 4-bit DAC, the least significant bit (LSB) is ________.

A
6.25% of full scale

B
0.625% of full scale

C
12% of full scale

D
1.2% of full scale

Q16: A binary-weighted-input digital-to-analog converter has an input resistor of 100 k. If the resistor is connected to a 5 V source, current through the resistor is ________.

A
50 mA

B
50 A

C
5 mA

D
500 A

Q17: An op-amp has very ________.

A
high voltage gain

B
high input impedance

C
low output impedance

D
all of the above

Q18: Which type of ADC quantizes the analog signal into a stream of bits whose amount corresponds to the signal level?

A
Successive approximation

B
Sigma-delta

C
Dual-slope

D
None of the above

Q19:
16.What is the result of taking more samples during the quantization process?

A
More errors in the analog-to-digital conversion

B
More bit requirements

C
More accurate signal representation

D
More bit requirements and more accurate signal representation

Q20: What do we call the manipulation of an analog signal in a digital domain?

A
Analog-to-digital conversion

B
Digital-to-analog conversion

C
Digital signal processing

D
Signal filtering

Q21: In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________.

A
5 volts

B
zero volts

C
a voltage determined by the binary weighted input

D
none of the above

Q22: How are unwanted frequencies removed prior to digital conversion?

A
Pre-filters

B
Digital signal processing

C
Sample-and-hold circuits

D
All of the above

Q23: Which is not an A/D conversion error?

A
Differential nonlinearity

B
Missing code

C
Incorrect code

D
Offset

Q24: Which is a typical application of digital signal processing?

A
Noise elimination

B
Music signal processing

C
Image processing

D
All of the above

Q25: How are unwanted frequencies removed prior to digital conversion?

A
Pre-filters

B
Digital signal processing

C
Sample-and-hold circuits

D
All of the above

Q26: Which term applies to the maintaining of a given signal level until the next sampling?

A
Holding

B
Aliasing

C
Shannon frequency sampling

D
"Stair-stepping"

Q27: A 4-bit R/2R ladder digital-to-analog converter uses ________.

A
one resistor value

B
two resistor values

C
three resistor values

D
four resistor values


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