Semiconductor integrated capacitive acceleration sensor and relative fabrication method
First Claim
1. An integrated capacitive acceleration sensor comprising a semiconductor material body defining a movable mass presenting movable electrodes directly facing respective fixed electrodes, and a PN junction arranged to provide isolation for biasing of said movable and fixed electrodes;
- said semiconductor material body including a monocrystalline sensor region forming said movable mass and said movable and fixed electrodes.
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Accused Products
Abstract
The acceleration sensor is formed in a monocrystalline silicon wafer forming part of a dedicated SOI substrate presenting a first and second monocrystalline silicon wafer separated by an insulting layer having an air gap. A well is formed in the second wafer over the air gap and is subsequently trenched up to the air gap to release the monocrystalline silicon mass forming the movable mass of the sensor; the movable mass has two numbers of movable electrodes facing respective pluralities of fixed electrodes. In the idle condition, each movable electrode is separated by different distances from the two fixed electrodes facing the movable electrode.
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Citations
29 Claims
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1. An integrated capacitive acceleration sensor comprising a semiconductor material body defining a movable mass presenting movable electrodes directly facing respective fixed electrodes, and a PN junction arranged to provide isolation for biasing of said movable and fixed electrodes;
- said semiconductor material body including a monocrystalline sensor region forming said movable mass and said movable and fixed electrodes.
- View Dependent Claims (8, 9, 10, 11)
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2. An integrated capacitive acceleration sensor comprising:
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a dedicated SOI substrate including a first wafer of monocrystalline silicon, an insulating material layer over said first wafer, and a second wafer of monocrystalline semiconductor material over said insulating material layer; said second wafer including a sensor region comprising movable electrodes directly facing fixed electrodes forming at least one capacitor; and a PN junction arranged to provide isolation for biasing of said movable and fixed electrodes, said insulating material layer being interrupted at an air gap defined by said first and second wafers and by said insulating material layer. - View Dependent Claims (3, 4, 5, 6, 7, 23, 24, 25)
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12. An integrated capacitive acceleration sensor comprising:
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a first wafer of monocrystalline silicon; a first layer of insulating material on said first wafer of monocrystalline silicon, said first layer of insulating material having a portion selectively removed therefrom; and a second wafer of monocrystalline silicon bonded on said first layer of insulating material, said second wafer of monocrystalline silicon including at least one trench formed therein to define at least one movable and at least one fixed electrode, and a PN junction arranged to provide isolation for biasing of said movable and fixed electrodes. - View Dependent Claims (13, 14, 15, 16, 17, 26, 27, 28, 29)
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18. An integrated capacitive acceleration sensor comprising:
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a semiconductor material including a first layer, an insulating layer and a monocrystalline wafer attached to said insulating layer, said monocrystalline wafer having an upper surface and a lower surface partially in contact with said insulating layer and including at least one trench formed between said upper surface and said lower surface of said monocrystalline wafer to define at least one moveable and at least one fixed electrode; and a PN junction arranged to provide isolation for biasing of said movable and fixed electrodes, wherein said at least one trench defines a movable structure. - View Dependent Claims (19, 20, 21, 22)
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Specification