Patent ID: 8181882

Claim:
A semiconductor device comprising: an antenna; a rectifier circuit electrically connected to the antenna; a first protection circuit; and a second protection circuit, wherein a first terminal of the first protection circuit is electrically connected to the antenna, and a second terminal of the first protection circuit is grounded, wherein a first terminal of the second protection circuit is electrically connected to an output terminal of the rectifier circuit, a second terminal of the second protection circuit is electrically connected to the antenna, and a third terminal of the second protection circuit is grounded, wherein the first protection circuit includes a first diode and a second diode, wherein the second protection circuit includes a capacitor and a transistor, wherein an anode of the first diode is electrically connected to the antenna, and a cathode of the first diode is grounded, wherein a cathode of the second diode is electrically connected to the antenna, an anode of the second diode is grounded, and the second diode is connected in parallel with the first diode, wherein one of electrodes of the capacitor is electrically connected to the antenna, wherein a gate electrode of the transistor is electrically connected to the output terminal of the rectifier circuit, wherein one of a source electrode and a drain electrode of the transistor is electrically connected to the other of the electrodes of the capacitor, and wherein the other of the source electrode and the drain electrode of the transistor is grounded.