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.