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GATE CSE 2025 Session 2 Q34: Clock frequency of a 4-bit ripple counter

Question

In a 4-bit ripple counter, if the period of the waveform at the last flip-flop is 64 microseconds, then the frequency of the ripple counter in kHz is ________. (Answer in integer)

Try it: numerical answer: type the value

Numerical answer. No negative marking.
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Answer: 250 (official GATE 2025 final answer key)

Concept used: Each flip-flop of a ripple counter divides the frequency by 2.

First step: The last of 4 flip-flops runs at f/24f/2^4, so the clock period is 64/1664/16 microseconds.

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Source: official GATE 2025 Session 2 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key

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