PHASE LOCKED LOOP AND METHOD OF OPERATING PHASE LOCKED LOOP

摘要

One phase-locked loop and a kind of method, for operate it is identical be arranged to reduce its region, pass through be shared in a receiving phase locked loop and one transmission phase-locked loop in a feed pump. First voltage controlled oscillator (222) is connected to loop filter (221) one by one. One second voltage voltage-tuning oscillator (232) is connected to one second loop filphase locking (231). First switch circuit (211) exports the feedback signal or a feedback signal exported from the first voltage controlled oscillator, responds switch control signal output from second voltage voltage-tuning oscillator. One phase detectors (212) receive an output signal of a reference signal and first switch circuit and generate control signal corresponding with a phase difference between signal receiving. One feed pump (213) is connected to phase detectors. One second switch circuit (214) forms the input terminal an output end of feed pump to be had to an input terminal of primary Ioops filter or the second loop filphase locking responding to switch control signal.