Phase detector, a timing recovery apparatus using the same, and the demodulation apparatus using the same

摘要

The timing reproduction part (12) is an absolute value of the value of the phase difference amplitude which is an absolute value of a value obtained by differentiating the amplitude in-phase component (II) of the baseband signal sampled by a sampling clock having a rate twice as high as the symbol rate by 1 / 2 of the symbol period and the bevel An average value (. Gamma. I) of 1 / 2 symbol time (1 / 2) of the synthesized amplitude fluctuation obtained by adding the amplitude amplitude component (QI) of the band band signal to the averaged part (22) is added to the averaging unit (22), which is an absolute value of the value obtained by differentiating the amplitude orthogonal component (QI) of the symbol period by 1 / 2, and the averaging unit (22) takes the average value (. Gamma. I) of the difference value The phase control signal (VI) corresponding to the phase control signal (VI) is output to the phase control unit (23) to control the timing phase of the sampling clock. The sampling clock is divided by a two frequency divider 24 to generate a reproduction symbol clock. The DC offset elimination and demodulation of the baseband signal sampled in parallel with the processing of the timing reproduction section (12) is performed using a reproduction symbol clock.