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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 interview.

This interesting question is from Counter Implementation and Applications topic in section Counters of Digital Circuits

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Correct choice is (a) Each flip-flop

To explain: A ripple counter is something that is derived by other flip-flops. It’s like a series of Flip Flops. The 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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