| 摘要 |
<p>PURPOSE:To obtain the clock almost in synchronizing with the picked up clock with the output of comparison, by phase-comparing the clock picked up from the reception signal with the reference clock, in the digital communication such as time sharing multiplex connection. CONSTITUTION:The clock from the reception signal picked up at the clock reproduction circuit 2 is phase-compared with the reference clock and the clock in 90 deg. phase shift at the phase detectors 5a, 5b, and the comparison detection output is given to the mixers 6a, 6b through the low pass filters 8a, 8b, and sample hold circuits 9a, 9b. On the other hand, the output of the tank circuit 2b of the clock reproduction circuit 2 is given to the level judgement circuit 13 after envelope detection. The level judgement circuit 13 supplies control signal to the smaple hold circuits 9a, 9b. The synthesis circuit 10 operates the output of the mixers 6a and 6b to produce the output in phase with the picked up clock.</p> |
