Patent ID: 7224211
Filing Date: 2007-05-29
Classification: G11C

Abstract:
1. A midpoint potential generating circuit for use in a semiconductor device, comprising: a booster power supply circuit that boosts a first supply voltage into a second supply voltage, and supplies the second supply voltage to an internal circuit of the semiconductor device; at least two first and second capacitors that are connected in series; a bias supply circuit that sets a midpoint potential between the first and second capacitors to a grounding potential or a negative potential at starting time, supplies the first supply voltage as the midpoint potential to a node between the first and second capacitors when the first supply voltage is equal to or higher than a first reference voltage, and supplies a predetermined voltage that is obtained from the second supply voltage outputted from the booster power supply circuit as the midpoint potential to the node between the first and second capacitors when the midpoint potential of the node between the first and second capacitors is equal to or higher than a second reference voltage.