Important Digital Logic and Design Short Questions

Chapter: 45
Question 1:
What is the primary disadvantage of a Successive-Approximation A/D converter compared to a Flash converter?
Answer: It is slower than the Flash converter.
Chapter: 45
Question 2:
What is a common error in A/D converters and how is it represented in a graph?
Answer: A common error is the Missing Code, where a binary code is not represented in the output. This is often shown as a gap in the staircase output graph.
Chapter: 45
Question 3:
How is an Offset Error in an A/D converter compensated?
Answer: It is compensated by adjusting the output to account for the offset error amount.
Chapter: 45
Question 4:
What is the difference between a Binary-Weighted-Input D/A Converter and an R/2R Ladder D/A Converter?
Answer: The Binary-Weighted-Input D/A Converter uses resistors with weighted values, while the R/2R Ladder D/A Converter uses a simpler resistor network of only two values, R and 2R.
Chapter: 45
Question 5:
What is resolution in the context of a D/A converter?
Answer: Resolution refers to the number of bits the converter uses, and it is the reciprocal of the number of discrete steps in the output, expressed as a percentage.
Chapter: 45
Question 6:
How does accuracy affect the output of a D/A converter?
Answer: Accuracy measures how closely the actual output matches the expected output. It is expressed as a percentage of the full-scale output voltage.
Chapter: 45
Question 7:
What defines the linearity of a D/A converter's output?
Answer: Linearity is defined by the output forming a straight line when the binary input varies between its minimum and maximum values.
Chapter: 45
Question 8:
What is meant by monotonicity in a D/A converter?
Answer: Monotonicity means that the output voltage should consistently increase as the binary input value increases.
Chapter: 45
Question 9:
How is settling time defined for a D/A converter?
Answer: Settling time is the time required for the D/A converter to stabilize within ±1/2 least significant bit of the final output value after a change in input.