Phase difference estimation device and communication device with the phase difference estimation device

摘要

A phase difference between synchronization data of reception data and a process clock by a digital circuit can be calculated. A phase difference estimation apparatus includes: a recovery unit (211) for separating recovery data and a recovery clock of input communication data, and outputting the recovery data and the recovery clock; a phase difference zero detection unit (212) for detecting a timing at which a phase difference between a generated process clock and the recovery clock is 0; a synchronization code detection unit (214) for detecting a synchronization code included in the recovery data by using the recovery clock; and a phase difference calculating unit (217) for calculating a phase difference between the synchronization code and the process clock using a ratio between a first number of clock generation times of the process clock in a period from a first time point when the phase difference detected by the phase difference zero detection unit is equal to 0 second time at which the phase difference is then equal to 0 and a second number of clock generation times of the process clock in a period from the first time to a third time at which the synchronization code is detected by the synchronization code detection unit.