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 a frequency of the divided CO signal and effectuate {TAIL ~ coarse tuning} of the CO based on {HEAD ~ 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 a frequency of the divided CO signal and effectuate { TAIL ~ coarse tuning } of the CO based on { HEAD ~ the comparison }
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