If the same analog signal is to be converted to an 8-bit resolution using a coun

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Question
If the same analog signal is to be converted to an 8-bit resolution using a counter-ramp ADC, how many comparator circuits would be used?
Options
A. 1
B. 8
C. 127
D. 255

Correct Answer

1

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2. Referring to the given figure, what appears to be wrong, if anything, with the output of the D/A converter?
Options
A. The input signal is probably noisy.
B. There appears to be some nonlinearity in the scope display.
C. The converter has a nonmonotonic output error.
D. It appears that certain input codes are incorrect; double-check the input coding.

3. Referring to the given figure, what should the display on the scope look like if the A/D converter is working properly?
Options
A. It should be a circular Lissajous pattern resulting from the simultaneous application of ramps to the vertical and horizontal inputs of the oscilloscope.
B. The pattern should be a straight line across the screen due to the equal but opposite voltages being applied to the scope inputs.
C. A uniform stairstep pattern should be displayed.
D. The scope should display a sequential binary count with the LSB on the left and the MSB on the right side of the display.

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

5. Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.
Options
A. very high voltage gain
B. unlimited bandwidth
C. a low slew rate
D. very high current gain

7. What is the resolution of a D/A converter?
Options
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

8. What is the current in R₁ and the current in R₂ for the circuit shown below?
Options
A. I₁ = 0.416 mA, I₂ = 0.416 mA
B. I₁ = 0.357 mA, I₂ = 0.357 mA
C. I₁ = 1.25 mA, I₂ = 0.625 mA
D. I₁ = 0.625 mA, I₂ = 1.25 mA

9. An actuator is usually a device that:
Options
A. converts analog data to meaningful digital data.
B. controls a physical variable.
C. stores digital data and then processes that data according to a set of specified instructions.
D. converts a physical variable to an electrical variable.

10. Sample-and-hold circuits in A/D converters are designed to:
Options
A. sample and hold the output of the binary counter during the conversion process
B. stabilize the comparator's threshold voltage during the conversion process
C. stabilize the input analog signal during the conversion process
D. sample and hold the D/A converter staircase waveform during the conversion process

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