| 摘要 |
PURPOSE:To reduce the lock time by varying a phase difference of an output signal of a filter section with a signal resulting from integrating a phase difference between a reception base band signal whose modulation component is eliminated and a recovered carrier and using a linear PLL section to generate the recovered carrier. CONSTITUTION:A received n-phase PSK modulation wave is detected by a phase detector 1 to obtain a base band signal having a phase component. An adder 9 of a linear PLL section 6 controls a phase of a signal formed by eliminating a noise component from an output eliminated with a modulation component in a modulation component eliminating section 4 at a filter section 5. A recovered carrier is generated thereby and a phase information extract section 2 extracts phase information from the received base band signal by using the recovered carrier. Since the linear PLL 6 is used, the lock time is reduced more than a conventional circuit employing a quadratic PLL. |
