Explanation: The drawback of zero crossing detectors can be in cured with the use of regenerative or positive feedback that causes the output to change faster and eliminate any false output transition due to noise signals at the input. 10. Name the comparator that helps to find unknown input.
A. Time marker generator
B. Zero crossing detectors
C. Phase meter
D. Window detector
Answer:A
Explanation: The drawback of zero crossing detectors can be in cured with the use of regenerative or positive feedback that causes the output to change faster and eliminate any false output transition due to noise signals at the input. 10. Name the comparator that helps to find unknown input.
A. Time marker generator B. Zero crossing detectors C. Phase meter D. Window detector
Explanation: Sometimes it is necessary to find the instant at which an unknown input is between two threshold levels. This can be achieved by a circuit called window detector. 11. Find the instance at which the input can be fed to the op-amp in a three level comparator with LED indicator.