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A ripple counter’s speed is limited by the propagation delay of __________

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A ripple counter’s speed is limited by the propagation delay of __________

(a) Each flip-flop

(b) All flip-flops and gates

(c) The flip-flops only with gates

(d) Only circuit gates

This question was posed to me during an online interview.

I need to ask this question from Counter Implementation and Applications topic in division Counters of Digital Circuits

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The correct choice is (a) Each flip-flop

The best explanation: A ripple counter is something that is derived by other flip-flops. Its like a series of Flip Flops. Output of one FF becomes the input of the next. Because ripple counter is composed of FF only and no gates are there other than FF, so only propagation delay of FF will be taken into account. Propagation delay refers to the amount of time taken in producing an output when the input is altered.

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