MEMS device with multiple electrodes and fabricating method thereof
First Claim
1. A MEMS device with multiple electrodes, being adapted to sense air pressure, comprising:
- a substrate;
a first electrode on the substrate;
a second electrode on the substrate, including a sensing portion and a stationary portion; and
a third electrode on the substrate, wherein when the sensing portion deforms, the stationary portion and the third electrode are spaced apart by a predetermined constant distance,wherein a stationary capacitor is defined between the stationary portion and the third electrode.
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Accused Products
Abstract
A MEMS device with a first electrode, a second electrode and a third electrode is disclosed. These electrodes are disposed on a substrate in such a manner that (1) a pointing direction of the first electrode is in parallel with a normal direction of the substrate, (2) a pointing direction of the third electrode is perpendicular to the pointing direction of the first electrode, (3) the second electrode includes a sensing portion and a stationary portion, (4) the first electrode and the sensing portion are configured to define a sensing capacitor, and (5) the third electrode and the stationary portion are configured to define a reference capacitor. This arrangement facilitates the MEMS device such as a differential pressure sensor, differential barometer, differential microphone and decoupling capacitor to be miniaturized.
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Citations
39 Claims
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1. A MEMS device with multiple electrodes, being adapted to sense air pressure, comprising:
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a substrate; a first electrode on the substrate; a second electrode on the substrate, including a sensing portion and a stationary portion; and a third electrode on the substrate, wherein when the sensing portion deforms, the stationary portion and the third electrode are spaced apart by a predetermined constant distance, wherein a stationary capacitor is defined between the stationary portion and the third electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A MEMS device with multiple electrodes, being adapted to sense air pressure, comprising:
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a substrate; a first electrode on the substrate; a second electrode configured to define a sensing capacitor between the first electrode and the second electrode; and a third electrode on the substrate, configured to define a stationary capacitor; wherein the third electrode disconnects from the second electrode or the third electrode disconnects from the first electrode, a pointing direction of the first electrode is in parallel with a normal direction of the substrate, a pointing direction of the third electrode is perpendicular to the pointing direction of the first electrode. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A MEMS device with multiple electrodes, comprising:
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a substrate; a first electrode on the substrate, wherein a pointing direction of the first electrode is in parallel with the normal direction of the substrate; a second electrode on the substrate, including a sensing portion and a stationary portion; and a third electrode on the substrate, wherein a pointing direction of the third electrode is perpendicular to the pointing direction of the first electrode; wherein the sensing portion faces the first electrode, the stationary portion faces the third electrode, when the sensing portion deforms, the stationary portion and the third electrodes are spaced apart by a predetermined constant distance. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A fabricating method of a MEMS device with multiple electrodes, the method comprising the following steps:
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providing a Silicon On Insulator (SOI) wafer, wherein the SOI wafer includes a device layer, an electrical insulation layer and a handle layer, wherein the electrical insulation layer is disposed between the device layer and the handle layer; etching the device layer to form a recession; etching the device layer having the recession to form a plurality of slots which expose the electrical insulation layer and to form a through hole which exposes the electrical insulation layer, wherein the slots and the recession define a second electrode which includes a sensing portion and a stationary portion, the through hole is disposed in the stationary portion, the slots also define a third electrode and a conductive post which is disposed inside the through hole and is electrically insulated from the stationary portion; providing a substrate wafer on which a first electrode is disposed; bonding the SOI wafer and the substrate wafer through wafer-to-wafer bonding to allow the second electrode and the third electrode to connect to a top surface of the substrate wafer, wherein the sensing portion faces the first electrode, the stationary portion faces the third electrode, a pointing direction of the third electrode is perpendicular to a pointing direction of the first electrode, the stationary portion and the third electrode are spaced apart by a predetermined constant distance, the second electrode and the third electrode are disposed on the substrate wafer, and the stationary portion and the third electrode is configured to define a stationary capacitor; and removing the handle layer. - View Dependent Claims (36, 37, 38, 39)
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Specification