CLOCK SYNCHRONIZATION CIRCUIT, CONTROL METHOD, PRINTED CIRCUIT BOARD AND COMMUNICATION DEVICE

A clock synchronization circuit, a control method, a printed circuit board and a communication device. The clock synchronization circuit comprises a first frequency divider, and an external reference signal processing module, a phase detector, a voltage control conversion module and a clock generator which are sequentially connected, the voltage control conversion module comprises a digital-to-analogue converter, a loop filtering module and a first switch module, a phase detection output end of the phase detector is connected to the loop filtering module, the digital-to-analogue converter and the loop filtering module are both connected to the first switch module; an output end of the first switch module is connected to the clock generator; and the clock generator is connected to a phase detection feedback end of the phase detector by means of the first frequency divider. L'invention concerne un circuit de synchronisation d'horloge, un procédé de commande, une carte de circuit imprimé et un dispositif de comm