Abstract—Anenhancementtoaconventionalinteger-phaselockedloop(PLL)isintroduced,analyzed,anddemonstratedexperimentallytosignificantlyreducevoltage-controlledoscillator(VCO)phasenoise.Theenhancement,whichinvolvesperiodicallyinjectionlockingtheVCOtoabufferedversionofthereference,hastheeffectofw