Microelectromechanical sensor having multiple full-scale and sensitivity values
First Claim
1. A microelectromechanical sensing structure comprising:
- a mobile element adapted to be displaced as a function of a quantity to be detected;
first fixed elements capacitively coupled to said mobile element and configured to implement with said mobile element to provide first detection conditions of said quantity; and
second fixed elements capacitively coupled to said mobile element and configured to implement with said mobile element to provide second detection conditions of said quantity, wherein said second detection conditions are different from said first detection conditions with respect to a full-scale value and a sensitivity value associated with detection of said quantity, wherein a total number of all of said first fixed elements is higher than a total number of all of said second fixed elements, and a lower value of said full scale and a higher value of said sensitivity is associated with said first fixed elements.
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Abstract
A microelectromechanical sensing structure is provided with a mobile element adapted to be displaced as a function of a quantity to be detected, and first fixed elements, capacitively coupled to the mobile element and configured to implement with the mobile element first detection conditions. The sensing structure is further provided with second fixed elements, capacitively coupled to the mobile element and configured to implement with the mobile element second detection conditions, which are different from the first detection conditions. In particular, the first and second detection conditions differ with respect to a full-scale or a sensitivity value in the detection of the aforesaid quantity.
40 Citations
23 Claims
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1. A microelectromechanical sensing structure comprising:
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a mobile element adapted to be displaced as a function of a quantity to be detected; first fixed elements capacitively coupled to said mobile element and configured to implement with said mobile element to provide first detection conditions of said quantity; and second fixed elements capacitively coupled to said mobile element and configured to implement with said mobile element to provide second detection conditions of said quantity, wherein said second detection conditions are different from said first detection conditions with respect to a full-scale value and a sensitivity value associated with detection of said quantity, wherein a total number of all of said first fixed elements is higher than a total number of all of said second fixed elements, and a lower value of said full scale and a higher value of said sensitivity is associated with said first fixed elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A sensor comprising:
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an electromechanical sensing structure comprising; a mobile element displaceable in response to a quantity to be detected; a plurality of first fixed elements capacitively coupled to said mobile element, said plurality of first fixed elements configured to operate with said mobile element to define a first detection condition of said quantity; and a plurality of second fixed elements capacitively coupled to said mobile element, said plurality of second fixed elements configured to operate with said mobile element to define a second detection condition of said quantity, wherein said first detection condition is different from said second detection condition with respect to a full-scale value and a sensitivity value associated with detection of said quantity, wherein a total number of all of said first fixed elements is higher than a total number of all of said second fixed elements, a lower value of said full scale and a higher value of said sensitivity is associated with said first fixed elements; processing electronics comprising a processing stage and a gain stage in communication with the processing stage, the processing stage configured to process output from the electromechanical sensing structure. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An electronic system for use in a motor vehicle, comprising:
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an electromechanical sensing structure comprising; a mobile element displaceable in response to a quantity to be detected; a plurality of first fixed elements capacitively coupled to said mobile element, said plurality of first fixed elements configured to operate with said mobile element to define a first detection condition of said quantity; a plurality of second fixed elements capacitively coupled to said mobile element, said plurality of second fixed elements configured to operate with said mobile element to define a second detection condition of said quantity, wherein said first detection condition is different from said second detection condition with respect to a full-scale value and a sensitivity value associated with detection of said quantity; wherein said mobile element comprises a body extending substantially along a plane and being free to rotate about a tilting axis away from said plane, and said first and second fixed elements are underneath said plane and face said body, said first fixed elements having a first facing area that faces said body and positioned at a first distance from said tilting axis, said second fixed electrodes having a second facing area that faces said body and positioned at a second distance from said tilting axis, said first facing area and said first distance are different from said second facing area and said second distance, respectively, a lower value of said full scale and a higher value of said sensitivity correspond to said first or second fixed elements having a greater facing area and a greater distance from said tilting axis; a processing stage coupled to said electromechanical sensing structure, said processing stage being adapted to process said quantity to be detected in order to control an airbag, an ABS, and/or a stability-control system of a motor vehicle. - View Dependent Claims (19, 20, 21, 22)
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23. A microelectromechanical sensing structure comprising:
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a mobile element adapted to be displaced as a function of a quantity to be detected; first fixed elements capacitively coupled to said mobile element and configured to implement with said mobile element to provide first detection conditions of said quantity; second fixed elements capacitively coupled to said mobile element and configured to implement with said mobile element to provide second detection conditions of said quantity, wherein said second detection conditions are different from said first detection conditions with respect to a full-scale value and a sensitivity value associated with detection of said quantity; wherein said mobile element comprises a body extending substantially along a plane and being free to rotate about a tilting axis away from said plane, and said first and second fixed elements are underneath said plane and face said body, said first fixed elements having a first facing area that faces said body and positioned at a first distance from said tilting axis, said second fixed electrodes having a second facing area that faces said body and positioned at a second distance from said tilting axis, said first facing area and said first distance are different from said second facing area and said second distance, respectively, a lower value of said full scale and a higher value of said sensitivity correspond to said first or second fixed elements having a greater facing area and a greater distance from said tilting axis.
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Specification