The fractional N frequency synthesizer 1 wherein the coarse tuning logic further comprises tuning logic adapted to compare a frequency of the divided reference signal and {HEAD ~ a frequency} of {TAIL ~ the divided CO signal} and effectuate coarse tuning of the CO based on the comparison 
The fractional N frequency synthesizer 1 wherein the coarse tuning logic further comprises tuning logic adapted to compare a frequency of the divided reference signal and { HEAD ~ a frequency } of { TAIL ~ the divided CO signal } and effectuate coarse tuning of the CO based on the comparison
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