| 摘要 |
PURPOSE: To reduce remaining noise by applying a phase loop error voltage to a voltage-controlled oscillator(VCO) through a filter to perform analog control over a demodulator. CONSTITUTION: This circuit is equipped with a demodulator 10 as a 4-phase demodulator, a processor module consisting of a module 11 for multiplication by (-j)<k> , a decision circuit 12 which obtains the sign of the real number part of a signal y<k> sent by the module 11, a clock rate error calculating circuit 13, a correcting circuit 14 which sends a clock signal H for control, a circuit 15 for phase error calculation, and a correcting circuit 16 which sends a phase error correction signal. The correcting circuit 16 includes a VCO 49 behind a filter 48 and supplies an analog control voltage to the demodulator 10. Consequently, the remaining noise is reducible to an arbitrary extent. |
