FUZZY-CONTROLLED PHASE LOCKING CIRCUIT AND CONTROL METHOD THEREFOR

摘要

PURPOSE: To provide a phase locked loop(PLL) circuit equipped with fuzzy control. CONSTITUTION: A PLL circuit 1 is provided with a phase comparator 2 and its output is connected to a low-pass filter 3 for driving a voltage controlled oscillator. The phase comparator 2 generates a signal expressing a phase difference between a signal generated by the oscillator 4 and an input signal. Further, this oscillator 4 is driven by a control signal generated by fuzzy control. The input of fuzzy control is a signal expressing the phase-difference.