MEMS pressure sensor with multiple membrane electrodes
First Claim
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1. A MEMS sensor comprising:
- a substrate layer;
a first fixed electrode defined in the substrate layer;
a second fixed electrode;
a cavity defined above the first fixed electrode;
a membrane extending over the cavity and supported by the substrate layer;
a first movable electrode defined in the membrane and located substantially directly above the first fixed electrode; and
a second movable electrode defined at least partially within the membrane and located at least partially directly above the cavity and the second fixed electrode, wherein no portion of the second movable electrode is located directly above the first fixed electrode.
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Abstract
In one embodiment, a MEMS sensor includes a first fixed electrode in a first layer, a cavity defined above the first fixed electrode, a membrane extending over the cavity, a first movable electrode defined in the membrane and located substantially directly above the first fixed electrode, and a second movable electrode defined at least partially within the membrane and located at least partially directly above the cavity.
20 Citations
20 Claims
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1. A MEMS sensor comprising:
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a substrate layer; a first fixed electrode defined in the substrate layer; a second fixed electrode; a cavity defined above the first fixed electrode; a membrane extending over the cavity and supported by the substrate layer; a first movable electrode defined in the membrane and located substantially directly above the first fixed electrode; and a second movable electrode defined at least partially within the membrane and located at least partially directly above the cavity and the second fixed electrode, wherein no portion of the second movable electrode is located directly above the first fixed electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of forming a MEMS sensor comprising:
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forming a first fixed electrode in a first layer; forming a second fixed electrode in the first layer; forming a membrane layer above the first layer such that the first layer supports the membrane layer; forming a first movable electrode in the formed membrane layer and located substantially directly above the formed first fixed electrode; forming a second movable electrode in the membrane layer at a location at least partially directly above the formed second fixed electrode, wherein no portion of the second movable electrode is located directly above the first fixed electrode; and forming a cavity between the first layer and the membrane layer, the cavity extending beneath the first movable electrode and at least partially beneath the second movable electrode. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A MEMS pressure system comprising:
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a MEMS sensor including a first fixed electrode in a first layer, a second fixed electrode in the first layer, a cavity defined above the first fixed electrode and the second fixed electrode, a membrane extending over the cavity, a first movable electrode defined in the membrane and located substantially directly above the first fixed electrode, and a second movable electrode defined at least partially within the membrane and located at least partially directly above the second fixed electrode, wherein no portion of the second movable electrode is directly above the first fixed electrode; a memory including program instructions stored therein; and a processor operably connected to the MEMS sensor and the memory and configured to execute the program instructions to obtain a first signal from the MEMS sensor using the first movable electrode, obtaining a second signal from the MEMS sensor using the second movable electrode, and determine a pressure based upon the first signal and the second signal. - View Dependent Claims (20)
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Specification