Logic circuit and semiconductor device
First Claim
1. A semiconductor device comprising:
- a logic circuit configured to perform clock gating, the logic circuit comprising a first transistor and a second transistor, the first transistor and the second transistor electrically connected to each other,wherein the first transistor comprises a silicon region in which a channel of the first transistor is formed, andwherein the second transistor comprises an oxide semiconductor layer in which a channel of the second transistor is formed.
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Accused Products
Abstract
In a logic circuit where clock gating is performed, the standby power is reduced or malfunction is suppressed. The logic circuit includes a transistor which is in an off state where a potential difference exists between a source terminal and a drain terminal over a period during which a clock signal is not supplied. A channel formation region of the transistor is formed using an oxide semiconductor in which the hydrogen concentration is reduced. Specifically, the hydrogen concentration of the oxide semiconductor is 5×1019 (atoms/cm3) or lower. Thus, leakage current of the transistor can be reduced. As a result, in the logic circuit, reduction in standby power and suppression of malfunction can be achieved.
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Citations
43 Claims
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1. A semiconductor device comprising:
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a logic circuit configured to perform clock gating, the logic circuit comprising a first transistor and a second transistor, the first transistor and the second transistor electrically connected to each other, wherein the first transistor comprises a silicon region in which a channel of the first transistor is formed, and wherein the second transistor comprises an oxide semiconductor layer in which a channel of the second transistor is formed. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor device comprising:
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a first transistor comprises a silicon region in which a channel of the first transistor is formed; a gate electrode layer over the first transistor; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween; a source electrode layer and a drain electrode layer in electrical contact with the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, the oxide semiconductor layer being located between the gate insulating layer and the oxide insulating layer, wherein a channel is formed in the oxide semiconductor layer, wherein the energy gap of the oxide semiconductor is higher than 2 eV, and wherein one of the source electrode layer and the drain electrode layer is in electrical contact with the first transistor. - View Dependent Claims (7, 8, 9, 10)
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11. A semiconductor device comprising:
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a first transistor comprises a silicon region in which a channel of the first transistor is formed; a gate electrode layer over the first transistor; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween; a source electrode layer and a drain electrode layer in electrical contact with the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, the oxide semiconductor layer being located between the gate insulating layer and the oxide insulating layer, wherein a channel is formed in the oxide semiconductor layer, wherein a concentration of hydrogen in the oxide semiconductor layer is 5×
1018 atoms/cm3 or lower, andwherein one of the source electrode layer and the drain electrode layer is in electrical contact with the first transistor. - View Dependent Claims (12, 13, 14, 15)
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16. A semiconductor device comprising:
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a first transistor, an insulating layer over the first transistor, and a second transistor over the insulating layer, the first transistor and the second transistor electrically connected to each other, wherein the first transistor comprises a silicon region in which a channel of the first transistor is formed, and wherein the second transistor comprises; a gate electrode layer; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween; a source electrode layer and a drain electrode layer in electrical contact with the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, the oxide semiconductor layer being located between the gate insulating layer and the oxide insulating layer, wherein a channel is formed in the oxide semiconductor layer, and wherein one of the source electrode layer and the drain electrode layer is in electrical contact with the first transistor. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A semiconductor device comprising:
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a first transistor comprises a silicon region in which a channel of the first transistor is formed; a gate electrode layer over the first transistor; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween; a source electrode layer and a drain electrode layer in electrical contact with the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, the oxide semiconductor layer being located between the gate insulating layer and the oxide insulating layer, wherein the oxide semiconductor layer comprises a first region and a second region, wherein a channel is formed in the first region, wherein the energy gap of the oxide semiconductor is higher than 2 eV, and wherein one of the source electrode layer and the drain electrode layer is in electrical contact with the first transistor. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A semiconductor device comprising:
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a first transistor comprises a silicon region in which a channel of the first transistor is formed; a gate electrode layer over the first transistor; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween; a source electrode layer and a drain electrode layer in electrical contact with the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, the oxide semiconductor layer being located between the gate insulating layer and the oxide insulating layer, wherein the oxide semiconductor layer comprises a first region and a second region, wherein a channel is formed in the first region, wherein a concentration of hydrogen in the oxide semiconductor layer is 5×
1018 atoms/cm3 or lower, andwherein one of the source electrode layer and the drain electrode layer is in electrical contact with the first transistor. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A semiconductor device comprising:
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a first transistor, an insulating layer over the first transistor, and a second transistor over the insulating layer, the first transistor and the second transistor electrically connected to each other, wherein the first transistor comprises a silicon region in which a channel of the first transistor is formed, wherein the second transistor comprises; a gate electrode layer; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween; a source electrode layer and a drain electrode layer in electrical contact with the oxide semiconductor layer; and an oxide insulating layer in contact with the oxide semiconductor layer, the oxide semiconductor layer being located between the gate insulating layer and the oxide insulating layer, wherein the oxide semiconductor layer comprises a first region and a second region, and wherein a channel is formed in the first region. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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Specification