Patent ID: 6989698

Claim:
A charge pump circuit comprising: a charge pumping unit having first and second input terminals, a bias terminal, and an output terminal, said charge pumping unit charging and discharging a capacitor connected to said output terminal, and setting up the current flowing to said output terminal in response to bias voltage applied to said bias terminal of said charge pumping unit; a current mirror unit having a bias terminal and an output terminal, said current mirror receiving a current flowing to said output terminal of said charge pumping unit, and controlling a voltage of said output terminal in response to bias voltage applied to said bias terminal of said current mirror unit; a control unit having a first input terminal connected to said output terminal of said charge pumping unit, a second input terminal connected to said output terminal of said circuit mirror unit, and an output terminal, said control unit controlling a control current flowing to said output terminal of said control unit in response to a difference of voltage between said first and said second input terminals of said control unit, and a biasing unit having a control terminal connected to said output terminal of said control unit, an output terminal connected to said bias terminal of said charge pumping unit and said bias terminal of said current mirror unit, and controlling a voltage of said output terminal of said biasing unit in response to said control current flowing to said control terminal of said biasing unit.