Phase detector, phase detecting method, and clock-and-data recovery device

A phase detecting method, comprising:

• sampling a first data input signal to generate a first data signal according to a first clock signal;
• sampling a second data input signal to generate a second data signal according to a second clock signal;
• sampling the second data signal to generate a third data signal according to the first clock signal;
• and
• generating a phase detecting result according to the first data signal and the third data signal.

A clock-and-data recovery device, comprising:

• a phase detector, comprising:
• a first sampling unit, arranged for sampling a first data input signal to generate a first data signal according to a first clock signal;
• a sampling module, comprising:
• a second sampling unit, arranged for sampling a second data input signal to generate a second data signal according to a second clock signal;
• and
• a third sampling unit, coupled to the second sampling unit, arranged for sampling the second data signal to generate a third data signal according to the first clock signal;
• and
• a phase determining module, coupled to the first sampling unit and the third sampling unit, arranged for generating a phase detecting result according to the first data signal and the third data signal;
• a charge pump, coupled to the phase detector, arranged for generating a charge control signal according to the phase detecting result;
• a loop filter, coupled to the charge pump, arranged for generating an oscillator control signal according to the charge control signal;
• and
• a controlled oscillator, coupled to the charge pump and the loop filter, arranged for receiving the oscillator control signal, for compensating a plurality of frequencies of the first clock signal and the second clock signal, and for outputting a compensated first clock signal and a compensated second clock signal.