ALL-DIGITAL PHASE-LOCKED LOOP FOR ADAPTIVELY CONTROLLING CLOSED-LOOP BANDWIDTH, METHOD OF OPERATING THE SAME, AND DEVICES INCLUDING THE SAME

摘要

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