Ripple carry counter

Question

For a N-stage ripple carry counter which uses flipflops of propagation delay = P ns and clock period of C ns. Give the expression of the frequency of input signal?

Comments

yes, it is incorrect.

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Check this diagram.

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So according to your diagram for this eqn. to satisfy

T_clock >= N*T_{flip_flop}

N must be 1.

Am I understanding it correctly? I'm weak in these timing diagrams.

Thanks

Answer 1

Propagation delay for a Ripple counter is given by formula = 

T_{propagation−delay}=n∗Tf_lipflops+T_{combinational.}
Where T_{propagation−delay=} 1/frequency(f)

where Strobe Signal's delay has to be treated as an additional Combinational crkt delay...