Patent ID: 8198927

Claim:
A charge pump system, comprising: a first charge pump and a second charge pump, having respective outputs coupled to respective loop filters, a loop filter of the first charge pump coupled to a load device; a first phase detector and a second phase detector, each having an output coupled to a respective input of one of the first and second charge pumps; a first flip flop having an output coupled to a first input of the second phase detector; a second flip flop having an input coupled to the output of the first flip flop and having an output coupled to a second input of the second phase detector; a delay element having an output coupled to a first input of the first phase detector and having an input coupled to: (i) an input of the first flip flop, (ii) a second input of the first phase detector; and an operational amplifier having an output coupled to a control input of both charge pumps and having a first input coupled to an output of a second charge pump and a second input coupled to one of a voltage reference and an output of the first charge pump.