Patent ID: 7053693

Claim:
A voltage generating circuit comprising: a first capacitor, a second capacitor which is a ferroelectric capacitor serially connected to the first capacitor, an output terminal, a third capacitor which grounds the output terminal, a supply voltage supplying terminal, a first switch which connects a connecting node of the first and second capacitors and the supply voltage supplying terminal, and a second switch which connects the connecting node and the output terminal; wherein during a first period, with the first switch and second switch placed in the OFF state, a first terminal of the first capacitor opposed to the connecting node is grounded and a second terminal of the second capacitor opposed to the connecting node is provided with a supply voltage; wherein during a second period following the first period, the first terminal is provided with the supply voltage and the second switch is placed in the ON state; wherein during a third period following the second period, the first switch is placed in the ON state, the second switch is placed in the OFF state, and the second terminal is grounded; wherein during a fourth period following the third period, the second terminal is provided with the supply voltage; and wherein thereafter the first through fourth periods are repeated.