Charge pump circuit for phase-locked loop

The invention relates to the technical field of phase-locked loops, in particular to a charge pump circuit for a phase-locked loop. The charge pump circuit is diet provided with a matching upper switch, a matching lower switch and an operational amplifier on the basis of an original upper current source, an original lower current source, an original upper switch and an original lower switch. The non-inverting input end of the operational amplifier is connected between the upper switch and the lower switch; the reverse input end of the operational amplifier is short-circuited with the output end of the operational amplifier, and the operational amplifier forms an operational amplifier voltage following circuit, so that the voltage of the non-inverting input end of the operational amplifieris the same as that of the output end, the value of an upper current is not changed when the upper switch is switched between conduction and non-conduction, and extra instantaneous charges are not generated; or when the lower