Patent ID: 8179175

Claim:
A reliable charge pump circuit, comprising: an operational amplifier; an upper current mirror connected to an noninverting input node and an inverting input node of said operational amplifier respectively; a lower current mirror, comprising two NMOS transistors which are connected to an output node of said operational amplifier; an integration capacitor connected to said inverting input node of said operational amplifier; a startup circuit for starting the reliable charge pump circuit, connected to said integration capacitor; and an anti-lock circuit, comprising a diode-connected NMOS transistor connected to said output node of said operational amplifier, wherein an drain node of said diode-connected NMOS transistor is connected to an gate node of said diode-connected NMOS transistor; and a current source connected to said diode-connected NMOS transistor, wherein said diode-connected NMOS transistor and said current source form a common-source drive.