DIGITAL PHASE LOCKED LOOP WITH IMPROVED LOOP DELAY FEATURE

摘要

PURPOSE: A digital phase-locked loop improving a loop delay is provided to reduce a delay on a closed loop by using multi page signals with difference phases. CONSTITUTION: A reference phase accumulating part(100) outputs a standard sampling phase value by sampling an accumulated value of a reference clock phase. A phase detector(200) detects a phase difference signal corresponding to the difference between a reference sampling phase value and the DCO sampling phase value. A digital loop filter(300) averages the phase difference signal by filtering the phase difference signal. A digital control oscillator(500) generates an oscillation signal based on an averaged phase difference signal. A DCO phase accumulator(600) generates a plurality of clock signals whose phases are delayed. A plurality of D-FFs are operated according to a plurality of clock signals.