Efficient Voltage Doubler

A charge pump circuit to generate an output voltage provided at an output node, including:

• an output generation stage having:
• a first branch, including a first transistor connected between a stage input voltage and, through a first node;
• a first plate of a first capacitor, and
• a second branch, including a second transistor connected between the stage input voltage and, through a second node, a first plate of a second capacitor, wherein a second plate of the first capacitor and a second plate of the second capacitor respectively receive first and second non-overlapping clock signals;
• first and second output gates respectively connected between the first and second nodes and a stage output node;
• and
• an auxiliary section stage having:
• a first branch, including a third transistor connected between the stage input voltage and, through a third node, a first plate of a third capacitor, and
• a second branch, including a fourth transistor connected between the stage input voltage and, through a fourth node, a first plate of a fourth capacitor, wherein a second plate of the third capacitor and a second plate of the fourth capacitor respectively receive the first and second non-overlapping clock signals, and wherein the gate of the third transistor is connected to the fourth node and the gate of the forth transistor is connected to the third node, and
• wherein the gate of the first transistor is connected to the fourth node and the gate of the second transistor is connected to the third node,
• wherein the output generation stage is one of a plurality of N output generation stages connected in series and the auxiliary section stage is the corresponding one of a plurality of N auxiliary section stages connected in series, and
• wherein the input voltage of each of the auxiliary section stages subsequent to the first of the series is independent of the input voltage of the corresponding output generation stage.