| 摘要 |
PURPOSE:To improve the phase locking characteristic of a recovered carrier by using a pattern whose phase rotating direction changes periodically for a clock recovery code. CONSTITUTION:An inverse modulator 15 applies inverse-modulation, a filter 16 eliminates the noise component and a limiter 17 makes the amplitude constant to obtain a recovered carrier. It is divided into two; the one is subject to phase shift by a pi/2 phase shifter 20, the result is detected by phase detectors 18, 19, identified by identification recovery circuits 23, 24 by using a clock recovered by a clock recovery circuit 21 and the result is combined by a parallel/serial converter 25. |
