Backside controlled MEMS capacitive sensor and interface and method
First Claim
1. A capacitive sensor element assembly, comprising:
- a semiconductive layer,a conductive layer,a first dielectric layer defining a cavity, the first dielectric layer being disposed between the semiconductive layer and the conductive layer, andan operational amplifier with an output terminal electrically connected to the conductive layer of the capacitive sensor element assembly and an input terminal electrically connected to the semiconductive layer of the capacitive sensor element assembly to reduce effects of parasitic capacitance of the capacitive sensor element assembly,wherein a conductor is disposed through the first dielectric layer to connect the conductive layer to the semiconductive layer.
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Abstract
Described herein is the sense element assembly for a capacitive pressure sensor and method for creating same that has increased sensitivity despite the parasitic capacitance that is created. The capacitive sensor element assembly, comprises a first semiconductive layer, and a first conductive layer, a first dielectric layer into which a cavity has been formed, the dielectric layer lying between the first semiconductive layer and the first conductive layer, wherein an electrical connection is made to the second conductive layer. A preferred method for fabricating a capacitive sensor assembly of the present invention comprises the steps of forming a dielectric layer on top of a conductive handle wafer; creating at least one cavity in the dielectric layer, bonding a thin semiconductive layer to the dielectric layer and connecting an operational amplifier to the input of the capacitive sensor assembly to overcome the parasitic capacitance formed during fabrication.
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Citations
14 Claims
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1. A capacitive sensor element assembly, comprising:
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a semiconductive layer, a conductive layer, a first dielectric layer defining a cavity, the first dielectric layer being disposed between the semiconductive layer and the conductive layer, and an operational amplifier with an output terminal electrically connected to the conductive layer of the capacitive sensor element assembly and an input terminal electrically connected to the semiconductive layer of the capacitive sensor element assembly to reduce effects of parasitic capacitance of the capacitive sensor element assembly, wherein a conductor is disposed through the first dielectric layer to connect the conductive layer to the semiconductive layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A capacitive sensor assembly comprising:
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a semiconductive layer, a conductive layer, a first dielectric layer defining a cavity, the first dielectric layer-being disposed between the semiconductive layer and the conductive layer, an operational amplifier with an output terminal electrically connected to the conductive layer of the capacitive sensor assembly and an input terminal electrically connected to the semiconductive layer of the capacitive sensor assembly to reduce effects of parasitic capacitance of the capacitive sensor assembly, and wherein a conductor extends through and electrically connects the conductive layer to the semiconductive layer. - View Dependent Claims (8)
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9. A capacitive sensor comprising:
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a semiconductive layer, a conductive layer, a first dielectric layer defining a cavity, the first dielectric layer being disposed between the semiconductive layer and the conductive layer; a connecting means for electrically connecting the conductive layer to the semiconductive layer, the connecting means extending through the first dielectric layer to electrically connect the conductive layer to the semiconductive layer; and wherein the capacitive sensor is configured to be connected to an operational amplifier with an output terminal electrically connectable to the conductive layer of the capacitive sensor and an input terminal electrically connectable to the semiconductive layer of the capacitive sensor to reduce effects of parasitic capacitance of the capacitive sensor. - View Dependent Claims (10)
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11. A capacitive sensor element assembly comprising:
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a semiconductive layer, a conductive layer underlying the semiconductive layer, a first dielectric layer defining a cavity, the first dielectric layer being disposed between the semiconductive layer and the conductive layer, a conductor extending through the first dielectric layer to electrically connect the conductive layer to the semiconductive layer, and an operational with an output terminal electrically connected to the conductive layer of the capacitive sensor element assembly and an input terminal electrically connected to the semiconductive layer of the capacitive sensor element assembly to reduce effects of parasitic capacitance of the capacitive sensor element assembly. - View Dependent Claims (12, 13, 14)
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Specification