Patent ID: 8571141

Claim:
A carrier recovery device, comprising: a phase detection module, for receiving an input signal and detecting a sine signal and a cosine signal in the input signal according to a sine parameter and a cosine parameter; a computation module, coupled to the phase detection module, for computing a phase angle between the sine signal and the cosine signal; a phase angle adjustment module, coupled to the phase detection module and the computation module, for adjusting the phase angle according to at least one of the sine signal or the cosine signal and a threshold, and outputting an adjusted phase angle, wherein the phase angle adjustment module compares the at least one of the sine signal or the cosine signal with the threshold, and reduces the phase angle when the at least one of the sine signal or the cosine signal is smaller than the threshold; a loop filter, coupled to the phase angle adjustment module, for generating a frequency offset angle according to the adjusted phase angle; and a conversion module, coupled to the loop filter and the phase detection module, for generating the sine parameter and the cosine parameter to the phase detection module according to the frequency offset angle.