A comparator circuit is used to
- A. Mark the instant when an arbitrary waveform attains some reference level
- B. Mark the-instant when the input voltage becomes constant
- C. Switch ON and OFF a circuit alternately at a particular rate
- D. Switch OFF a circuit when output becomes zero
Answer: A. Mark the instant when an arbitrary waveform attains some reference level
Explanation: A comparator compares an input waveform against a reference level and switches its output state at the precise instant the input reaches or crosses that reference level.