Patent ID: 8345401

Claim:
A semiconductor device comprising: a rectifier circuit configured to rectify a carrier wave or an amplitude modulation wave received through an antenna, the rectifier circuit including: a first diode, wherein an anode of the first diode is electrically connected to one terminal of the antenna; and a capacitor, wherein one electrode of the capacitor is electrically connected to a cathode of the first diode and the other electrode of the capacitor is electrically connected to the other terminal of the antenna, a protection circuit electrically connected to the rectifier circuit, the protection circuit including; a first resistor, wherein one terminal of the first resistor is electrically connected to the cathode of the first diode and one electrode of the capacitor; a second diode, wherein an anode of the second diode is electrically connected to the other terminal of the first resistor; a second resistor, wherein one terminal of the second resistor is electrically connected to a cathode of the second diode and the other terminal of the antenna; a transistor, wherein one of a source and a drain of the transistor is electrically connected to the other terminal of the second resistor, the other of a source and a drain of the transistor is electrically connected to one terminal of the first resistor and the cathode of the first diode, and a gate of the transistor is electrically connected to the other terminal of the first resistor and the anode of the second diode; and a switch, wherein first terminal of the switch is electrically connected to the anode of the first diode and one terminal of the antenna, second terminal of the switch is electrically connected to the other terminal of the antenna, the other electrode of the capacitor, the cathode of the second diode and one terminal of the second resistor, and third terminal of the switch is electrically connected to one of a source and a drain of the transistor and the other terminal of the second resistor.