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AUTOMATIC FREQUENCY BAND CALIBRATION METHOD FOR RAPID LOCK OF PHASE-LOCKED LOOP SYSTEM

Abstract(summary):

An automatic frequency band calibration method for rapid lock of a phase-locked loop system. An AFC module is used to calibrate the frequency band of a VCO, and automatically select a frequency band according to a target frequency point, thereby realizing rapid lock of a phase-locked loop. The method relates to using closed-loop calibration, controlling the hopping of the frequency dividing ratio of a frequency divider, locking Vctrl voltage using the phase-locked loop, sequentially obtaining a characteristic frequency dividing ratio of each frequency band to realize calibration of the corresponding characteristic frequency of each frequency band in an actual circuit, and storing characteristic frequency dividing ratio control words using a register. On the basis of the characteristic frequency dividing ratio result locked in the process, under a normal operation status, the outside provides a frequency dividing ratio corresponding to the target frequency point, the frequency band where the frequency point is located is automatically deduced, and a frequency band code is directly set to realize rapid lock of the phase-locked loop. The AFC algorithm provided by the method needs only a small number of registers to record and deduce calibration data of a larger number of frequency points, thereby saving resources and realizing rapid lock of the phase-locked loop.


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