As PLLs have some disadvantages such as the narrow synchronizing and pull-in ranges to smooth clocks with low-frequency large-amplitude jitter and wander

this paper presents a novel universal digital clock smoothness technique ─ the counting prognostication method.The key element of this technique is to use counting results in a cycle to prognosticate numbers in the next cycle.Principles and performance analyses are given to show that it can efficiently smooth jitter and wander

jitter accumulation is small

and the synchronizing and the pull-in range is very wide to smooth different frequencies.In addition

for applications in some special circumstances

the cycle varied counting prognostication method is also presented to diminish the capture time.