Fast-locking phase locked loop and fast locking method
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United States of America
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Jan 21, 2020
Grant Date -
Nov 28, 2019
app pub date -
Sep 6, 2018
filing date -
Sep 6, 2018
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Abstract
A fast-locking phase locked loop and a fast locking method are provided. The fast locking method includes dividing a frequency of an oscillation signal by a preset divisor to output a divided signal, detecting a frequency difference between the divided signal and a reference signal, tracking whether a divided frequency of the divided signal falls within a locked frequency range or not, if not, tracking the divided frequency, and if yes, locking the divided frequency, detecting a divided phase difference between a divided phase of the divided signal and a reference phase of the reference signal, recording the phase difference as a tracking reference phase difference, tracking a next divided phase according to the tracking reference phase difference, and determining whether the divided phase falls within a locked phase range, and if not, tracking the divided phase, and if yes, locking the divided phase.
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