| 摘要 |
PURPOSE:To simplify the generator and to attain superior phase comparison even when a bit rate of a demodulated signal is changed by outputting a specific signal including a phase error signal only for a period set by the phase error signal. CONSTITUTION:A demodulated signal Sd fed to an input terminal 2 is fed to a data terminal of a D flip-flop(DFF) 5 and fed to an exclusive OR circuit(EXOR) 6 and its output signal is used as an output period setting signal Sp of a phase error signal. The signal Sp is fed to a clock terminal of the DFF 7 and fed to a switch circuit 9 as a switching control signal. An output signal from an EXOR 8 receiving an output signal from the DFF 7 is fed to an output terminal 4 as a phase error signal via the switch circuit 9 and the switch circuit 9 is turned on only when the output period setting signal Sp is on a high level. Thus, a window pulse generating means for phase comparison in a phase comparator circuit 1 is not required. |
