1 results about "Wrong frequency" patented technology

A kind of phase detector, phase-locked loop, radio frequency circuit and terminal equipment, it relates to radio frequency technical field, to solve the problem of the deterioration of sweep frequency difference caused by phase detector overflow.Phase detector includes first TDC, second TDC and TDC selection unit, first TDC measures the time difference between reference signal and feedback signal to obtain first phase detection signal, second TDC measures the time difference between reference signal and feedback signal to obtain second phase detection signal, TDC selection unit selects first phase detection signal or second phase detection signal to obtain third phase detection signal, and the third phase detection signal is used to determine the frequency difference information of phase-locked loop.Through TDC selection unit, dynamic switching is made between two TDCs, when one TDC has overflow, the phase detection signal output by the other TDC is selected to generate frequency difference information, and the wrong frequency difference feedback of overflow TDC is discarded, the phase detection operation without overflow is realized, and the problem of the deterioration of sweep frequency difference caused by phase detector overflow is solved.