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In the circuit shown below, the propagation delay of each NOT gate is 2 nsec, then the time period of generated square wave is –

I think it should be 22ns but it is given 20ns

Suppose at time 0 the output at last FF ( right most FF) is 0

Then at time 12 nsec output will change from 0 to 1

But the first FF get the input at 10nsec and thus the output at last FF will change from 1 to 0 at 22nsec.

So, the output changes 0 -> 1  -> 0 in 22nsec.

Where I am doing wrong.

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