Patent ID: 8018269

Claim:
A charge pump comprising: an operational amplifier having a negative feedback loop, a positive input terminal coupled to a reference voltage, and a negative input terminal coupled to a charge pump output terminal; a first main switching transistor coupled between a positive power supply and a first intermediate node with a control terminal coupled to a first inverted control signal; a first biased transistor coupled between the first intermediate node and the charge pump output terminal with a control terminal coupled to an output of the operational amplifier; a second main switching transistor coupled between a ground and a second intermediate node with a control terminal coupled to a second control signal; a second biased transistor coupled between the second intermediate node and the charge pump output terminal with a control terminal coupled to a reference current source; and a first auxiliary switching transistor and a second auxiliary switching transistor coupled between the first intermediate node and the second intermediate node with control terminals respectively coupled to a first control signal and a second inverted control signal.