SYNCHRONIZATION TRACKING CIRCUIT AND COMMUNICATION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To adjust a phase change quantity equivalent to shifting of a phase between a following clock 2nd a received signal by calculating a correlation power concerning front/rear plural phases and deciding a difference between a phase giving its maximum value and a synchronous phase to be the phase change quantity with respect to the following clock. SOLUTION: A clock period selecting and phase change cumulative value calculating part 2 detects an input maximizing correlation power among nine inputs given from respective correlation power calculating parts 1A to 1I, detects a phase difference between a phase giving this and a synchronous phase and corrects the phase difference (phase changing quantity) to a corrected value so as to maximize the correlation power of the synchronizing phase to give it to a following clock generation circuit 3. The circuit 3 controls the phase (period) of the following clock to be generated based on the phase changing quantity reported from the part 2. This function is realized by adaptively switching the feedback period of a circulation clock by a switch.