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US 8,127,998 B2Granted
Semiconductor device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsMunehiro Kozuma, Yoshiyuki Kurokawa
Life of this patent
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Abstract
A semiconductor device is provided, which includes an antenna, a first circuit (a boosting circuit), a second circuit (a reference voltage supply circuit), and a third circuit (a voltage comparison circuit). The first circuit is electrically connected to the antenna, and includes at least a first charge pump, a second charge pump, and a first switch disposed between the first charge pump and the second charge pump. The second circuit is configured to generate a reference voltage in accordance with a first output voltage supplied from the first charge pump. The third circuit is configured to compare the reference voltage, the first output voltage, and a second output voltage supplied from the second charge pump.
Claims16
A semiconductor device comprising:
- an antenna;
- a first circuit electrically connected to the antenna, wherein the first circuit comprises a first charge pump, a second charge pump, a third charge pump, and a first switch disposed between the second charge pump and the third charge pump;
- a second circuit configured to generate a reference voltage in accordance with a first output voltage supplied from the first charge pump;
- and
- a third circuit configured to compare the reference voltage with a second output voltage supplied from the second charge pump to generate an output signal,
- wherein the first switch is turned on or off in accordance with the output signal,
- wherein an output terminal of the first charge pump is electrically connected to an input terminal of the second charge pump and the second circuit,
- wherein an output terminal of the second charge pump is electrically connected to a first terminal of the first switch and the third circuit, and
- wherein a second terminal of the first switch is electrically connected to an input terminal of the third charge pump.
6 more elements
A semiconductor device comprising:
- an antenna;
- a first circuit electrically connected to the antenna, wherein the first circuit comprises a first charge pump, a second charge pump, a third charge pump, and a first switch disposed between the second charge pump and the third charge pump;
- a second circuit configured to generate a reference voltage in accordance with a first output voltage supplied from the first charge pump;
- a third circuit configured to compare the reference voltage with a second output voltage supplied from the second charge pump to generate an output signal;
- a second switch disposed between the first circuit and a logic circuit;
- and
- a controller configured to control the second switch in accordance with the output signal,
- wherein the first switch is turned on or off in accordance with the output signal,
- wherein the antenna is electrically connected to a first input terminal of the first charge pump, a first input terminal of the second charge pump, and a first input terminal of the third charge pump,
- wherein an output terminal of the first charge pump is electrically connected to a second input terminal of the second charge pump and the second circuit,
- wherein an output terminal of the second charge pump is electrically connected to a first terminal of the first switch and the third circuit, and
- wherein a second terminal of the first switch is electrically connected to a second input terminal of the third charge pump.
9 more elements
A semiconductor device comprising:
- an antenna;
- a first circuit electrically connected to the antenna, wherein the first circuit comprises a first charge pump, a second charge pump, a third charge pump, a fourth charge pump, a first switch disposed between the second charge pump and the third charge pump, and a second switch disposed between the third charge pump and the fourth charge pump;
- a second circuit configured to generate a reference voltage in accordance with a first output voltage supplied from the first charge pump;
- a third circuit configured to compare the reference voltage with a second output voltage supplied from the second charge pump to generate an output signal;
- a third switch disposed between the first circuit and a logic circuit, and
- a controller configured to control the third switch in accordance with the output signal,
- wherein the first switch is turned on or off in accordance with the output signal,
- wherein each of the first charge pump, the second charge pump, the third charge pump, and the fourth charge pump comprises a diode and a capacitor element,
- wherein the antenna is electrically connected to a first input terminal of the first charge pump, a first input terminal of the second charge pump, a first input terminal of the third charge pump, and a first input terminal of the fourth charge pump,
- wherein an output terminal of the first charge pump is electrically connected to a second input terminal of the second charge pump and the second circuit,
- wherein an output terminal of the second charge pump is electrically connected to a first terminal of the first switch and the third circuit,
- wherein a second terminal of the first switch is electrically connected to a second input terminal of the third charge pump, and
- wherein the first switch is turned on when the reference voltage is larger than the second output voltage.
10 more elements
Dependencies are inferred from the claim text.