Low voltage SOI (Silicon On Insulator) logic circuit
First Claim
Patent Images
1. A low voltage SOI (Silicon On Insulator) logic circuit comprising:
- a first power supply line;
a second power supply line;
a first SOI FET (Field Effect Transistor) whose source and body are connected to said first power supply line;
a second SOI FET whose source and body are connected to said second power supply line; and
a logic circuit connected between a drain of said first SOI FET and a drain of said second SOI FET;
wherein said logic circuit is constituted by a plurality of SOI FETs whose bodies are made floating state, and a connection between said first power supply line ahd said logic circuit and a connection between said second power supply line and said logic circuit are switched by a signal supplied to a gate of said first SOI FET and a gate of said second SOI FET.
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Abstract
A SOI (Silicon On Insulator) logic circuit including serially connected power switching SOI MOSFETs (44, 45) and a logic circuit (43) constituted by SOI MOSFETs. The bodies of the MOSFETs of the logic circuit are made floating state, thereby implementing low threshold voltage MOSFETs. The bodies of the power switching MOSFETs are biased to power supply potentials, thereby implementing high threshold MOSFETs. The low threshold voltage MOSFETs enable the logic circuit to operate at a high speed in an active mode, and the high threshold voltage power switching MOSFETs can reduce the power dissipation in a sleep mode.
130 Citations
16 Claims
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1. A low voltage SOI (Silicon On Insulator) logic circuit comprising:
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a first power supply line; a second power supply line; a first SOI FET (Field Effect Transistor) whose source and body are connected to said first power supply line; a second SOI FET whose source and body are connected to said second power supply line; and a logic circuit connected between a drain of said first SOI FET and a drain of said second SOI FET; wherein said logic circuit is constituted by a plurality of SOI FETs whose bodies are made floating state, and a connection between said first power supply line ahd said logic circuit and a connection between said second power supply line and said logic circuit are switched by a signal supplied to a gate of said first SOI FET and a gate of said second SOI FET. - View Dependent Claims (2, 3, 4)
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5. A low voltage SOI (Silicon On Insulator) logic circuit comprising:
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a first power supply line; a second power supply line; a first SOI FET (Field Effect Transistor) whose source is connected to said first power supply line, and whose body is connected to a gate of said first SOI FET; a second SOI FET whose source is connected to said second power supply line, and whose body is connected to a gate of said second SOI FET; and a logic circuit connected between a drain of said first SOI FET and a drain of said second SOI FET; wherein said logic circuit is constituted by a plurality of SOI FETs whose bodies are made floating state, and a connection between said first power supply line and said logic circuit and a connection between said second power supply line and said logic circuit are switched by a signal supplied to said gate of said first SOI FET and said gate of said second SOI FET. - View Dependent Claims (6, 7, 8)
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9. A low voltage SOI (Silicon On Insulator) logic circuit comprising:
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a first power supply line; a second power supply line; a power switching SOI FET (Field Effect Transistor) whose source and body are connected to said first power supply line; and a logic circuit connected between a drain of said power switching SOI FET and said second power supply line; wherein said logic circuit is constituted by a plurality of SOI FETs whose bodies are made floating state, and a connection between said first power supply line and said logic circuit is switched by a signal supplied to a gate of said power switching SOI FET. - View Dependent Claims (10, 11, 12)
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13. A low voltage SOI (Silicon On Insulator) logic circuit comprising:
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a first power supply line; a second power supply line; a power switching SOI FET (Field Effect Transistor) whose source is connected to said first power supply line, and whose body is connected to a gate of said power switching SOI FET; and a logic circuit connected between a drain of said power switching SOI FET and said second power supply line; wherein said logic circuit is constituted by a plurality of SOI FETs whose bodies are made floating state, and a connection between said first power supply line and said logic circuit is switched by a signal supplied to said gate of said power switching SOI FET. - View Dependent Claims (14, 15, 16)
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Specification