Phase-locked loop working system

A phase-locked loop working system, comprising:

• a pre-frequency divider, a phase frequency detector, a charge pump, a filter, a voltage-controlled oscillator, a loop frequency divider and a circuit parameter regulator;
• wherein
• the phase frequency detector, the charge pump, the filter, the voltage-controlled oscillator and the loop frequency divider are sequentially coupled end to end to form a phase-locked loop circuit;
• the circuit parameter regulator is coupled to the phase-locked loop circuit and is used to adjust a filtering resistor and a filter capacitor in the filter, to control a loop parameter generated by the phase-locked loop circuit to be within a preset margin range;
• and
• the circuit parameter regulator is coupled to the phase-locked loop circuit and is further used to adjust at least one of a frequency division coefficient of the pre-frequency divider or a frequency of the signal to be processed inputted into the pre-frequency divider, to control the loop parameter generated by the phase-locked loop circuit to be within the preset margin range, and to reduce a capacitance value of the filtering capacitor in the filter.