Patent ID: 9030891
Filing Date: 2015-05-12
Classification: G11C

Abstract:
1. A charge pump circuit, comprising a clock driving unit, a voltage boosting unit, a boosting swing control unit, a first NMOS (N-type Metal-Oxide-Semiconductor) tube, a first current minor unit, a second NMOS tube and a second current mirror unit; wherein the clock driving unit is adapted to form a clock driving signal based on a second mirror current output by the second current minor unit and output the clock driving signal to the voltage boosting unit; the voltage boosting unit is adapted to boost a voltage based on the clock driving signal and output a boosted voltage to the boosting swing control unit and the first current minor unit; the boosting swing control unit is adapted to output a boosting swing control signal to a gate electrode of the first NMOS tube based on the boosted voltage; the first current mirror unit comprises a first PMOS tube and a second PMOS (P-type Metal-Oxide-Semiconductor) tube, where gate electrodes of the first and second PMOS tubes are connected, source electrodes of the first and second PMOS tubes are connected and input with the boosted voltage, a drain electrode and the gate electrode of the first PMOS tube are connected with a drain electrode of the first NMOS tube, and a drain electrode of the second PMOS tube outputs the first minor current; a source electrode of the first NMOS tube is an output terminal of the charge pump circuit, a gate electrode of the second NMOS tube is input with a first voltage and a drain electrode thereof is connected with the drain electrode of the second PMOS tube; and the second current mirror unit comprises a third NMOS tube and a fourth NMOS tube, where gate electrodes of the third and fourth NMOS tubes are connected, source electrodes of the third and fourth NMOS tubes are input with a second voltage, a drain electrode and the gate electrode of the third NMOS tube are connected with the source electrode of the second NMOS tube, and a drain electrode of the fourth NMOS tube outputs the second minor current, and the second voltage is lower than the first voltage.