Phase detector, phase detection method and clock data recovery device

The invention relates to a phase detector, a phase detection method and a clock data recovery device. The phase detector comprises a first sampling unit, a sampling module and a phase determination module. The first sampling unit is used for sampling a first data input signal according to a first clock signal to generate a first data signal. The sampling module comprises a second sampling unit and a third sampling unit, wherein the second sampling unit is used for sampling a second data input signal according to a second clock signal to generate a second data signal, and the third sampling unit is used for sampling the second data signal according to the first clock signal to generate a third data signal. The phase determination module is used for generating a phase detection result according to the first data signal and the third data signal, wherein the phase detection result represents advanced or delayed judgment results of the first clock signal and the second clock signal.