Patent ID: 7564297

Claim:
A power supply circuit comprising: a charge-pump circuit comprising at least one MOS transistor and at least one capacitor coupled thereto; means for charging said at least one capacitor to a charging voltage by applying a specified input voltage through said at least one MOS transistor to one side of said capacitor when a clock at a first level is input to the opposite side of said capacitor, and said at least one MOS transistor is in an ON state; and means for generating a generated voltage at a level obtained by increasing said charging voltage to a level equal to an amplitude of said clock when said clock is at a second level, and said at least one MOS transistor is in an OFF state; and a gate control circuit to apply a control voltage to a gate electrode of said at least one MOS transistor to set said at least one MOS transistor into an OFF or ON state, in synchronization with a change in a voltage of said at least one capacitor to said generated voltage or said charging voltage.