Modulation circuit and semiconductor device including the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsYukiko Yamashita, Tatsuji Nishijima
Life of this patent
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Abstract
An object of the present invention is to reduce the power consumption of a modulation circuit. The modulation circuit includes a load, a diode, and a transistor. An anode of the diode is electrically connected to one terminal of an antenna via the load; a cathode of the diode is electrically connected to one of a source and a drain of the transistor; the other of the source and the drain of the transistor is electrically connected to the other terminal of the antenna; and the transistor is controlled to be turned on or off in accordance with a signal input to a gate of the transistor.
Claims22
A semiconductor device comprising an antenna and a modulation circuit;
- wherein the modulation circuit comprises a load, a diode and a transistor,
- wherein the load, the diode and a source and a drain of the transistor are connected in series between two consecutive branch points of the modulation circuit, between two terminals of the antenna,
- wherein the load comprises at least one of a resistor and a capacitor,
- wherein the transistor is controlled to be turned on or off in accordance with a signal input to a gate of the transistor, and
- wherein the diode is a diode-connected transistor.
A semiconductor device comprising an antenna and a modulation circuit;
- wherein the modulation circuit comprises a resistor, a diode, and a transistor,
- wherein the resistor, the diode and a source and a drain of the transistor are connected in series between two consecutive branch points of the modulation circuit, between two terminals of the antenna,
- wherein the transistor is controlled to be turned on or off in accordance with a signal input to a gate of the transistor, and
- wherein the diode is a diode-connected transistor.
A semiconductor device comprising an antenna and a modulation circuit;
- wherein the modulation circuit comprises a capacitor, a diode, and a transistor,
- wherein the diode, the capacitor and a source and a drain of the transistor are connected in series between two consecutive branch points of the modulation circuit, between two terminals of the antenna,
- wherein the transistor is controlled to be turned on or off in accordance with a signal input to a gate of the transistor, and
- wherein the diode is a diode-connected transistor.
Dependencies are inferred from the claim text.