Patent ID: 6833752
Filing Date: 2004-12-21
Classification: H02M

Abstract:
A charge pump, comprising:a plurality of phase generators including a first primary phase generator producing a first phase signal and a third phase signal, a first secondary phase generator producing a fifth phase signal, a second primary phase generator producing a second phase signal and a fourth phase signal, and a second secondary phase generator producing a sixth phase signal; wherein the first phase signal and the second phase signal are non-overlapping and crossing around high points during every phase cycle, the third phase signal and the fourth phase signal are non-overlapping and crossing around low points during every phase cycle, and the fifth phase signal and the sixth phase signal are non-overlapping and crossing around high points during every phase cycle; first pre-boot capacitor coupled to receive the first phase signal and the third phase signal from the plurality of phase generator and second pre-boot capacitor coupled to receive the second phase signal and the fourth phase signal from the plurality of phase generators; first main pump capacitor coupled to receive the fifth phase signal from the plurality of phase generators and coupled to the first pre-boot capacitor; second main pump capacitor coupled to receive the sixth phase signal from the plurality of phase generators and coupled to the second pre-boot capacitor; a blocking circuit to prevent charge from the first and second main pump capacitors from leaking back to the first and second pre-boot capacitors, wherein the blocking circuit is coupled to the plurality of phase generators to control operation of the blocking circuit; and first and second gating devices coupled to the first and second main pump capacitors, respectively and producing therefrom a pumped voltage in excess of a supply voltage.