ALL-DIGITAL PHASE-LOCKED LOOP FOR ADAPTIVELY CONTROLLING A CLOSED-LOOP BANDWIDTH, METHOD THEREOF, AND DEVICES HAVING THE SAME

摘要

An operation method of an all-digital phase-locked loop (ADPLL) includes a step of detecting a phase change of a feedback signal of the ADPLL by using a search window and a step of controlling a closed-loop bandwidth of the ADPLL based on a detected result. A closed-loop bandwidth when the phase change is detected outside of the search window is greater than a closed-loop bandwidth when the phase change is detected within the search window.