| 摘要 |
PURPOSE:To obtain stable clock similar to the picked up clock in phase based on the detected output, by detecting the phase difference between the clock picked up from the reception signal and the reference clock, in the digital communication such as time sharing multiplex connection. CONSTITUTION:The clock is picked up at the clock reproduction circuit 2 from the input from the reception signal input terminal 1. The picked up clock and the reference clock from the terminal 4 are inputted to the phase detector 5. The level of the phase detected output is judged at the level discriminator 8 and inputted to the switch 9. The reference clock is inputted to the switch 9 and the reference clock in 180 deg. phase shift is inputted to the switch circuit 9. Further, if the output of the level discriminator 8 is more than specified level, the reference clock is outputted to the terminal 11 as it is and if less than the specified level, the reference clock phase shifted by 180 deg. is outputted. |
