| 摘要 |
<p>PURPOSE:To stabilize bit synchronism to large variation of a transmitted signal, and to perform smooth phase follow-up operation for an extracted clock, by detecting the phase difference between the detected edge of a transmitted digital signal and a trigger pulse circulating in a shift register, and decreasing the phase difference. CONSTITUTION:A 1-0 transition edge of transmitted digital binary data is detected by an edge detecting circuit 3, and both a leading and a trailing edge output detected by the circuit 3 are applied as trigger signals to a timing control circuit 5. The output of this circuit 5 is inputted to a shift register circuit 4 receiving a basic clock. This circuit 4 is constituted as a flywheel circuit consisting of a shift register and a gate circuit. Then, the control circuit 5 detects the phase difference between the detected edge of the digital signal and a trigger pulse circulating the shift register to generate a timing signal so that the phase difference is reduced, and thus bit synchronism to large variation of the transmitted signal is stabilized to perform smooth phase follow-up operation for an extracted clock.</p> |
