Fast-locking phase locked loop and fast locking method

A fast-locking phase locked loop, comprising:

• an oscillating circuit outputting an oscillating signal;
• a divider coupled to the oscillating circuit, configured to divide the oscillating signal by a preset divisor to output a divided signal;
• a phase frequency detector coupled to the divider, configured to receive a reference signal and the divided signal, and detect a frequency difference between a divided frequency of the divided signal and a reference frequency of the reference signal, wherein the phase frequency detector is configured to detect a phase difference between a rising edge of one of a plurality of divided waveforms of the divided signal and a rising edge of a corresponding reference waveform in the reference signal;
• a frequency phase locking circuit coupled to the phase frequency detector, configured to receive the reference difference and track the divided frequency according to the reference difference, wherein when the divided frequency falls into a locking frequency range, the frequency phase locking circuit locks the divided frequency;
• and
• a phase recorder coupled to the phase frequency detector and the frequency phase locking circuit, wherein when the frequency phase locking circuit locks the divided frequency, the phase difference detected by the phase frequency detector serves as a tracking reference phase difference to be recorded in the phase recorder;
• wherein the frequency phase locking circuit is configured to track the other divided waveform after the divided waveform of the divided signal according to the tracking reference phase difference, and when the frequency phase locking circuit determines the divided phase of the divided waveform that is tracked falls within a locking phase range, the frequency phase locking circuit locks the divided phase that is tracked.