Patent ID: 7176731

Claim:
A circuit for compensating for leakage charge in a Phase Locked Loop, comprising: a first plurality of charge pumps, wherein each charge pump comprises a source charge pump and a sink charge pump, and each charge pump has its own switch; a second plurality of charge pumps, wherein each charge pump comprises a source charge pump and a sink charge pump, and each charge pump has its own switch; a first node coupled between at least one source charge pump and at least one sink source pump; a second node coupled between at least one source charge pump and at least one sink source pump; a phase lock loop filter coupled to the first node; a dummy filter coupled to the second node; a first input of a differential mode sensor coupled to the phase lock loop filter; a second input of the differential mode sensor coupled to the dummy filter; a first input of a common mode sensor coupled to the dummy filter; and a second input of the common mode sensor coupled to the phase locked loop filter.