Fast phase locking method for phase-locked loop

The invention discloses a fast phase locking method for a phase-locked loop, and relates to the technical field of phase-locked loops. The method comprises the following steps: step 1, calibrating several frequency points before the phase-locked loop works, storing capacitance control words corresponding to the several frequency points, when the output frequency of the phase-locked loop needs to be changed to a target value, firstly reading the capacitance array control words corresponding to the frequency points, then controlling the phase-locked loop to enter a closed loop state, and finally changing the output frequency of the phase-locked loop to a target value; starting a normal locking process; and step 2, capacitance calibration of the voltage-controlled oscillator is carried out, and a topological structure of the LC voltage-controlled oscillator is adopted. The loop bandwidth of the phase-locked loop is 310KHz, the phase margin is 51 degrees, in the locking process of the phase-locked loop, within 10