Microelectromechanical sensor device with reduced stress sensitivity
First Claim
1. A MEMS sensor device comprising:
- a substrate having a top surface extending in a horizontal plane;
an inertial mass suspended over the substrate;
elastic coupling elements elastically coupled to the inertial mass and enabling inertial movement of the inertial mass with respect to the substrate as a function of a quantity to be detected along a sensing axis in the horizontal plane;
sensing electrodes capacitively coupled to the inertial mass and forming at least one sensing capacitor;
a suspension structure, the sensing electrodes rigidly coupled to first portions of the suspension structure, the inertial mass being elastically coupled to second portions of the suspension structure by the elastic coupling elements, the suspension structure including electrical-insulation regions that electrically insulate the first portions of the suspension structure from the second portions of the suspension structure, the electrical-insulation regions forming reverse-biased PN junctions with the first portions of the suspension structure and the second portions of the suspension structure adjacent to the electrical-insulation regions;
elastic suspension elements coupled to the suspension structure; and
an anchorage structure fixed with respect to said substrate, the suspension structure being coupled to the anchorage structure by the elastic suspension elements.
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Accused Products
Abstract
A MEMS sensor device provided with a sensing structure, having: a substrate with a top surface extending in a horizontal plane; an inertial mass, suspended over the substrate; elastic coupling elements, elastically connected to the inertial mass so as to enable inertial movement thereof with respect to the substrate as a function of a quantity to be detected along a sensing axis belonging to the horizontal plane; and sensing electrodes, capacitively coupled to the inertial mass so as to form at least one sensing capacitor, a value of capacitance of which is indicative of the quantity to be detected. The sensing structure moreover has a suspension structure, to which the sensing electrodes are rigidly coupled, and to which the inertial mass is elastically coupled through the elastic coupling elements; the suspension structure is connected to an anchorage structure, fixed with respect to the substrate, by means of elastic suspension elements.
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Citations
20 Claims
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1. A MEMS sensor device comprising:
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a substrate having a top surface extending in a horizontal plane; an inertial mass suspended over the substrate; elastic coupling elements elastically coupled to the inertial mass and enabling inertial movement of the inertial mass with respect to the substrate as a function of a quantity to be detected along a sensing axis in the horizontal plane; sensing electrodes capacitively coupled to the inertial mass and forming at least one sensing capacitor; a suspension structure, the sensing electrodes rigidly coupled to first portions of the suspension structure, the inertial mass being elastically coupled to second portions of the suspension structure by the elastic coupling elements, the suspension structure including electrical-insulation regions that electrically insulate the first portions of the suspension structure from the second portions of the suspension structure, the electrical-insulation regions forming reverse-biased PN junctions with the first portions of the suspension structure and the second portions of the suspension structure adjacent to the electrical-insulation regions; elastic suspension elements coupled to the suspension structure; and an anchorage structure fixed with respect to said substrate, the suspension structure being coupled to the anchorage structure by the elastic suspension elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for manufacturing a MEMS sensor device, the method comprising:
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forming an inertial mass suspended over a surface of a substrate; forming elastic coupling elements, wherein the elastic coupling elements elastically are coupled to the inertial mass so as to enable inertial movement of the inertial mass with respect to the substrate; forming first sensing electrodes coupled to the inertial mass;
forming a suspension structure and second sensing electrodes that are rigidly coupled to first portions of the suspension structure so as to form at least one sensing capacitorwherein the inertial mass is elastically coupled to second portions of the suspension structure by the elastic coupling elements, wherein the suspension structure is coupled to an anchorage structure fixed with respect to the substrate by elastic suspension elements; and forming electrical-insulation regions in the suspension structure, the electrical-insulation regions electrically insulating the first portions of the suspension structure from the second portions of the suspension structure, the electrical-insulation regions forming reverse-biased PN junctions with the first portions of the suspension structure and the second portions of the suspension structure adjacent to the electrical-insulation regions. - View Dependent Claims (15, 16)
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17. An electronic device comprising:
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a microprocessor; and a MEMS sensor coupled to the microprocessor, the MEMS sensor including; a substrate having a first surface; a plurality of anchors coupled to the first surface of the substrate; a plurality of elastic suspension elements coupled to the plurality of anchors, respectively; a suspension structure suspended relative to the first surface of the substrate by the plurality of elastic suspension elements, the suspension structure being substantially rigid in a first direction and having a central axis, the suspension structure including first, second, third, and fourth electrical-insulation regions that electrically insulate first portions of the suspension structure from second portions of the suspension structure, the first and second electrical-insulation regions being on a first side of the central axis, the third and fourth electrical-insulation regions being on a second side of the central axis, at least one of the first or the second electrical-insulation regions being asymmetrically arranged with respect to the third and fourth electrical-insulation regions relative to the central axis; an inertial mass suspended relative to the first surface of the substrate; elastic coupling elements elastically coupled to the inertial mass and to the first portions of the suspension structure, the elastic coupling elements enabling movement of the inertial mass with respect to the substrate in the first direction; and sensing electrodes coupled to the second portions of the suspension structure, the sensing electrodes being capacitively coupled to the inertial mass and forming sensing capacitors, respectively. - View Dependent Claims (18, 19, 20)
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Specification