LOW-POWER FREQUENCY DIVIDER AND LOW-POWER PHASE-LOCKED LOOP EQUIPPED THEREWITH

摘要

The present invention discloses a low-power frequency divider and a low-power phase-locked loop which keep power consumption to a minimum. The low-power frequency divider generates a frequency-divided signal with frequency equal to the frequency of the input signal divided by a fixed ratio, and is equipped with a phase-voltage converter, a comparator, a phase-locked loop and a reset circuit. The phase-voltage converter generates a phase-voltage signal corresponding to the phase change of said input signal in response to the reset circuit. The comparator generates a comparison signal by comparing said phase-voltage signal with the reference phase-voltage signal. The phase-locked loop generates said frequency-divided signal by matching said input signal and said comparison signal. The reset circuit generates said reset signal in response to said comparison signal or said frequency-divided signal.