Phase locked loop apparatus having multiple negative feedback loop

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase locked loop apparatus having a plurality of sub feedback loops, and more particularly, to a phase locked loop apparatus having a plurality of sub feedback loops including two sub feedback loops to fix the frequency and phase of output signals output from the voltage controlled oscillator To a phase locked loop device. An external feedback loop for comparing the reference signal and the frequency division signal of the output signal output from the voltage controlled oscillator and outputting a voltage corresponding to the frequency difference and the phase difference to fix the frequency and phase of the predetermined output signal; And an internal feedback loop which is constituted by a negative feedback loop independent of the external feedback loop and receives a frequency of the output signal to sense a frequency change and outputs a voltage corresponding to the frequency change, A phase-locked loop device having a plurality of sub-feedback loops is disclosed, wherein the outer feedback loop is a negative feedback loop and the inner feedback loop is a dominant feedback loop according to a predetermined range of two slope values .