Patent ID: 7009432

Claim:
A charge pump circuit comprising: a reference current circuit including a first operational amplifier having a positive input port and a negative input port, said reference current circuit being operable for defining a reference current through a first biasing transistor and having a first low output impedance associated therewith, and being coupled to a first output transistor to provide a negative current to an output of the charge pump circuit; a replication feedback circuit including a second operational amplifier having a positive input port and a negative input port, said replication feedback circuit being coupled to said reference current circuit at a coupling node and operable for replicating said output voltage at said coupling node such that said reference current is defined in a second biasing transistor and having a second low impedance, and being coupled to a second output transistor to provide a positive current to the output of the charge pump circuit; and reconfiguration means for permitting the charge pump circuit to be reconfigured to couple the positive input ports of the first and second operational amplifiers to the output voltage of the charge pump circuit and to couple the negative input ports of the first and second operational amplifiers to a reference voltage.