Phase frequency detector and charge pump circuits applying to integral frequency division phase-locked loop

The invention belongs to the technical field of integrated circuit, in particular to PFD (phase frequency device) and CP (charge pump) circuits applying to an integral frequency division phase-locked loop. The PFD circuit adopts four Latches, so that output signals UP and UPB, and DN and DNB have very good symmetry to reduce the clock feedthrough effect and charge injection effect of the CP circuit; two PMOS tubes with small size are adopted to realize level recovery function, solve the problems that the UP, UPB, DN and DNB signals are in an uncertainty state when the circuit is electrified, and prevent the work error of the CP circuit; the CP circuit adopts two rail-to-rail constant transconductance operational amplifiers so as to solve the problems of current mismatch and charge sharing, adopts four dummy tubes so as to solve the problem of charge injection, and adopts two resistances with small size so as to effectively reduce the charge and discharge current spikes.