if we take optimal strenght = 3.59 , N comes 7.2 . Meaning N = 7 or 8 is optimal. For 3 inv ( N = 7 ) , delay is around 35.09. If we don't want inversion , buffer length of 4 gives better result as its obtained for optimal strength = 3.59 and it being 4 is approximation.
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when we add 4 inverters, we get a delay of 35.29 < 35.85(delay i got using 2 inverters)
Yeah, same doubt.
if we take optimal strenght = 3.59 , N comes 7.2 . Meaning N = 7 or 8 is optimal. For 3 inv ( N = 7 ) , delay is around 35.09. If we don't want inversion , buffer length of 4 gives better result as its obtained for optimal strength = 3.59 and it being 4 is approximation.
Please do provide the slides of these videos as mentioned. It will be really helpful