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Digital Electronics - Interfacing to the Analog World

Exercise : Interfacing to the Analog World - General Questions
41.
What is one advantage to using a parallel-encoded (flash) ADC?
less expensive
very fast conversion
less complicated circuit
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
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?
1
8
127
255
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
What is the major advantage of the R/2R ladder D/A converter as compared to a binary-weighted D/A converter?
It has fewer parts for the same number of inputs.
It is much easier to analyze its operation.
It uses only two different resistor values.
The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
What is the main disadvantage of the stairstep-ramp A/D converter?
The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
It requires a counter.
It requires a precision clock in order for the conversion to be reliable.
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
What is the purpose of a sample-and-hold circuit?
To keep temporary memory
To hold a voltage constant so an ADC has time to produce an output
To hold a voltage constant so a DAC has time to produce an output
To hold data after a multiplexer has selected an output
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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