Patent ID: 9455854
Filing Date: 2016-09-27
CPC Classification: H03L,H04B,H04L

Claim Text:
1. A phase-locked loop frequency calibration method, applied to selection of a subband for a multi-band voltage-controlled oscillator, and comprising: performing, within a counting time T calculating an error between FCNT[k] and a target frequency count value FCNT wherein the dynamically adjusting T when the absolute value of the error is greater than or equal to the predetermined value, stopping counting an output frequency, corresponding to the current working subband, of the voltage-controlled oscillator, and entering a next subband in a binary search; and when the absolute value of the error is less than the predetermined value, increasing the counting time T while the binary search is completed, using a subband that corresponds to a minimum absolute value of an error in the foregoing errors as the target subband in which the voltage-controlled oscillator works.