Patent ID: 7046743

Claim:
A demodulator comprising: a phase detector receiving a signal and detecting a phase of the received signal to output a detection result representative of the detected phase; a first differential circuit delaying the detection result for a predetermined period of time to produce first delay information and calculating a difference between the detection result and the first delay information to output first phase difference information; a second differential circuit delaying the first delay information for the predetermined period of time to produce second delay information and calculating a difference between the first delay information and the second delay information to output second phase difference information; a third differential circuit calculating a difference between the first phase difference information and the second phase difference information to output third phase difference information; a phase error detector calculating a phase error on a basis of the third phase difference information to output the phase error; and a phase corrector correcting the phase of the received signal on a basis of the first phase difference information and the phase error.