Patent ID: 7777541
Filing Date: 2010-08-17
Classification: H03L

Abstract:
1. A charge pump circuit, comprising: a pump-up circuit comprising a first switch coupled between a pump-up output node and a first power supply node that is controlled by a first control signal, and a source off path coupled between the pump-up output node and a second power supply node that is controlled by second and third control signals, wherein the first switch is configured to be on when the source off path is configured to be a high impedance path, and the source off path is configured to be a low impedance path for a first duration and a high impedance path for a second duration when the first switch is configured to be off; and a pump-down circuit comprising a second switch coupled between a pump-down output node and the second power supply node that is controlled by a fourth control signal, and a sink off path coupled between the pump-down output node and the first power supply node that is controlled by fifth and sixth control signals, wherein the second switch is configured to be on when the sink off path is configured to be a high impedance path, and the sink off path is configured to be a low impedance path for a third duration and a high impedance path for a fourth duration when the second switch is controlled to be off.