Interfacing to the Analog World - General Questions (6)

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Interfacing to the Analog World - General Questions

41.

What is the major advantage of the R/2R ladder DAC as compared to a binary-weighted-input DAC?

A.	It has fewer parts for the same number of inputs.
B.	It is much easier to analyze its operation.
C.	It uses only two different resistor values.
D.	The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.

Answer: Option C

Explanation:

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42.

The practical use of binary-weighted digital-to-analog converters is limited to:

A.	R/2R ladder D/A converters
B.	4-bit D/A converters
C.	8-bit D/A converters
D.	op-amp comparators

Answer: Option B

Explanation:

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43.

What is the speed of the up/down digital-ramp ADC (tracking ADC)?

A.	20
B.	10
C.	1
D.	Relatively slow

Answer: Option D

Explanation:

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44.

What is the conversion time of a flash converter?

A.	20
B.	10
C.	1
D.	The conversion takes place continuously.

Answer: Option D

Explanation:

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45.

What is the resolution of a D/A converter?

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

Answer: Option B

Explanation:

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46.

Which of the following characterizes an analog quantity?

A.	Discrete levels represent changes in a quantity.
B.	Its values follow a logarithmic response curve.
C.	It can be described with a finite number of steps.
D.	It has a continuous set of values over a given range.

Answer: Option D

Explanation:

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47.

One major difference between a counter-ramp A/D converter and a successive-approximation converter is:

A.	the counter-ramp A/D converter is much faster than the successive-approximation converter
B.	with the successive-approximation converter the final binary result is always slightly less than the equivalent analog input, whereas with the counter-ramp A/D converter it is slightly more
C.	with the successive-approximation converter the final binary result is always slightly more than the equivalent analog input, whereas with the counter-ramp A/D converter it is slightly less
D.	none of the above

Answer: Option B

Explanation:

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48.

What is the maximum output voltage for the circuit shown below?

mcq15_1010_1 (1)

A.	â€“20 volts
B.	â€“5 volts
C.	â€“9.375 volts
D.	â€“2.1775 volts

Answer: Option C

Explanation:

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Interfacing to the Analog World - General Questions (6)

Interfacing to the Analog World - General Questions

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