Semiconductor device
First Claim
1. A semiconductor device comprising:
- a rectifier circuit; and
a protection circuit comprising;
a first transistor;
a second transistor;
a rectifier element;
a first resistor; and
a second resistor,wherein an input terminal of the rectifier circuit is electrically connected to one of a source and a drain of the second transistor,wherein an output terminal of the rectifier circuit is electrically connected to one of a source and a drain of the first transistor and a first terminal of the second resistor,wherein a second terminal of the second resistor is electrically connected to a terminal of the rectifier element and a gate of the first transistor,wherein the other of the source and the drain of the first transistor is electrically connected to a terminal of the first resistor and a gate of the second transistor,wherein a semiconductor layer of the first transistor includes silicon, andwherein a semiconductor layer of the second transistor includes an oxide semiconductor.
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Accused Products
Abstract
To prevent damage on an element even when a voltage high enough to break the element is input. A semiconductor device of the invention operates with a first voltage and includes a protection circuit which changes the value of the first voltage when the absolute value of the first voltage is higher than a reference value. The protection circuit includes: a control signal generation circuit generating a second voltage based on the first voltage and outputting the generated second voltage; and a voltage control circuit. The voltage control circuit includes a transistor which has a source, a drain, and a gate, and which is turned on or off depending on the second voltage input to the gate and thus controls whether the value of the first voltage is changed based on the amount of current flowing between the source and the drain. The transistor also includes an oxide semiconductor layer.
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Citations
32 Claims
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1. A semiconductor device comprising:
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a rectifier circuit; and a protection circuit comprising; a first transistor; a second transistor; a rectifier element; a first resistor; and a second resistor, wherein an input terminal of the rectifier circuit is electrically connected to one of a source and a drain of the second transistor, wherein an output terminal of the rectifier circuit is electrically connected to one of a source and a drain of the first transistor and a first terminal of the second resistor, wherein a second terminal of the second resistor is electrically connected to a terminal of the rectifier element and a gate of the first transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a terminal of the first resistor and a gate of the second transistor, wherein a semiconductor layer of the first transistor includes silicon, and wherein a semiconductor layer of the second transistor includes an oxide semiconductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a rectifier circuit; and a protection circuit comprising; a first circuit comprising; a first transistor; a rectifier element; a first resistor; and a second resistor; and a second circuit comprising; a second transistor, wherein an input terminal of the rectifier circuit is electrically connected to the second circuit, wherein an output terminal of the rectifier circuit is electrically connected to the first circuit, wherein a terminal of the second resistor is electrically connected to a terminal of the rectifier element and a gate of the first transistor, wherein one of a source and a drain of the first transistor is electrically connected to a terminal of the first resistor and a gate of the second transistor, wherein a semiconductor layer of the first transistor includes silicon, and wherein a semiconductor layer of the second transistor includes an oxide semiconductor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A semiconductor device comprising:
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an antenna; a rectifier circuit electrically connected to the antenna; and a protection circuit comprising; a first transistor; a second transistor; a rectifier element; a first resistor; and a second resistor, wherein an input terminal of the rectifier circuit is electrically connected to one of a source and a drain of the second transistor, wherein an output terminal of the rectifier circuit is electrically connected to one of a source and a drain of the first transistor and a first terminal of the second resistor, wherein a second terminal of the second resistor is electrically connected to a terminal of the rectifier element and a gate of the first transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a terminal of the first resistor and a gate of the second transistor, wherein a semiconductor layer of the first transistor includes silicon, and wherein a semiconductor layer of the second transistor includes an oxide semiconductor. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A semiconductor device comprising:
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an antenna; a rectifier circuit electrically connected to the antenna; and a protection circuit comprising; a first circuit comprising; a first transistor; a rectifier element; a first resistor; and a second resistor; and a second circuit comprising; a second transistor, wherein an input terminal of the rectifier circuit is electrically connected to the second circuit, wherein an output terminal of the rectifier circuit is electrically connected to the first circuit, wherein a terminal of the second resistor is electrically connected to a terminal of the rectifier element and a gate of the first transistor, wherein one of a source and a drain of the first transistor is electrically connected to a terminal of the first resistor and a gate of the second transistor, wherein a semiconductor layer of the first transistor includes silicon, and wherein a semiconductor layer of the second transistor includes an oxide semiconductor. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification