RADIO COMMUNICATION DEVICE, DEMODULATION METHOD, AND FREQUENCY DEFLECTION CORRECTION CIRCUIT

摘要

A demodulation unit (13) receives a burst signal which has been subjected to phase modulation by the TDMA-TDD method of mobile communication and demodulates it with the synchronous detection method (or quasi-synchronous detection method). The demodulation unit (13) prepares three or more stages of the time constant of a loop filter (14) existing in a frequency deflection correction unit and a carrier reproduction unit. Switching of the time constant is performed by a selector switch (15) according to a control signal from a demodulation control unit (16). By increasing the pull-in speed and suppressing the jitter after the convergence, it is possible to obtain a highly-accurate frequency deflection correction required for operation of the synchronous detection (or quasi-synchronous detection) without increasing the circuit size.