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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

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The query is from Asynchronous Counter in division Counters of Digital Circuits

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Right choice is (a) Each flip-flop

For explanation I would say: A ripple counter is something that is derived by other flip-flops. It’s 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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