Question
Which of the following can divide the frequency of a pulse train by 2?
Answer Options
- A) An XOR gate
- B) A flip-flop
- C) An OR gate
- D) A multiplexer
Correct Answer: B
Explanation
Frequency division is a fundamental process in digital electronics, particularly in synthesizers and counters. It involves generating an output signal that has a lower frequency than the input signal, typically by a precise integer ratio.
A flip-flop (specifically configured as a T-type or toggling flip-flop) can reliably divide the frequency of a pulse train by 2. The flip-flop changes its state only once for every two input clock pulses, causing the output signal frequency to be exactly half the input clock frequency. Cascading multiple flip-flops creates a binary ripple counter capable of dividing by powers of two (2, 4, 8, 16, etc.).
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