| 摘要 |
PURPOSE:To extract and reproduce a carrier without developing a phase jitter by detecting the phase error of converted carriers based on two detection signals that orthogonally intersect and are outputted from a phase detector and controlling the partially oscillating frequency of a frequency converter so as to minimize said phase error. CONSTITUTION:The two detection signals e1 and e2 that are outputted by the phase detector l and orthogonally intersect are inputted to a carrier extractor 2. Receiving the two detection signals e1 and e2 that the phase detector outputs, a control circuit 10 detects the phase error DELTAtheta between the carriers of outputs a' converted by the frequency converter 9, forms a phase error signal (ec) corresponding to said error, and outputs it to a voltage controlled oscillator 8. It generates the partially oscillating frequency (d) with the prescribed frequency to make the phase errorDELTAtheta into zero. Accordingly, if a reception signal (a) has the fluctuation of ites frequency, the frequency converter 9 absorbs the fluctuation, and supplies a signal PSK with a fixed carrier frequency the same as the central frequency of a band-pass filter 4 to the carrier extractor 2 and the phase detector 1. |
