PHASE COMPENSATION CIRCUIT

摘要

PURPOSE:To attain a clock regenerative circuit with very high reliability, by shifting a reference timing in a phase comparison circuit suitably in response to an input block signal, and obtaining correct phase error information at the output of the phase comparison circuit. CONSTITUTION:A phase detecting circuit 2 detects a phase difference between the input clock signal extracted from a receiving signal and the reference timing signal having almost equal frequency to the clock frequency for a period designated with a control signal G from a control circuit 4. Further, a phase shift circuit 5 gives a delay to a timing signal C from a signal input terminal 7 by using a phase difference signal K controlling the amount of phase shift for the purpose of phase shift and controls the phase of a phase comparison reference signal L for output so that the timing of the clock component is positioned at the center of the effective phase comparison range of a phase comparison circuit 6. Thus, correct phase error information is obtained at an output of the phase comparison circuit 6.