The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 2016
Filed:
Jun. 03, 2015
Huawei Technologies Co., Ltd., Shenzhen, CN;
Huawei Technologies Co., Ltd., Shenzhen, CN;
Abstract
The present invention provides a phase-locked loop frequency calibration method and system, where the method includes: performing, within a counting time T[k], frequency counting on a frequency signal that is output in a current working subband by a voltage-controlled oscillator, to obtain a frequency count value FCNT[k], where the current working subband corresponds to a binary value of a current node in a binary search tree; and calculating an error between FCNT[k] and a target frequency count value FCNT[k], comparing an absolute value of the error with a predetermined value, dynamically adjusting T[k] in a value range of T[k] according to a comparison result, and determining, in combination with a binary search algorithm, a target subband in which the voltage-controlled oscillator works. Such a dynamic calibration method can effectively shorten the calibration time on the whole.