Patent ID: 8035484

Claim:
a semiconductor device comprising: an antenna; a rectifier circuit electrically connected to the antenna; a charge accumulation circuit electrically connected to the rectifier circuit; and a voltage circuit electrically connected to the charge accumulation circuit, wherein the charge accumulation circuit includes switches and capacitors, wherein all of the capacitors in the charge accumulation circuit are configured to be connected in parallel to one another through the switches, wherein all of the capacitors in the charge accumulation circuit are directly connected to ground lines, wherein each of the switches comprises a transistor and a diode, wherein one of source and drain of the transistor is electrically connected to one terminal of the diode, and the other one of source and drain of the transistor is electrically connected to the other terminal of the diode such that when a charge accumulated in a capacitor is determined to reach a predetermined threshold level, the transistor is switched on to allow charge accumulation of the next capacitor, wherein accumulation of charges in the capacitors is controlled by the transistor, and wherein discharge of charges from the capacitors is controlled by the diode.