Patent ID: 7583131
Filing Date: 2009-09-01
Classification: H02M

Abstract:
1. A charge pump circuit comprising: a positive electric potential generating charge pump circuit that generates a positive electric potential; a negative electric potential generating charge pump circuit that generates a negative electric potential; a semiconductor substrate of a first general conductivity type to which the negative electric potential is applied; a control circuit that controls the negative electric potential generating charge pump circuit and the positive electric potential generating charge pump circuit; a well of a second general conductivity type formed in a first surface portion of the semiconductor substrate, the positive electric potential being applied to the well; and a diffusion layer of the second general conductivity type formed in a second surface portion of the semiconductor substrate, wherein the control circuit controls the positive and negative electric potential generating charge pump circuits so that the positive electric potential generating charge pump circuit starts generating the positive electric potential after the negative electric potential generating charge pump circuit starts generating the negative electric potential.