MEMS multi-axis accelerometer electrode structure
First Claim
1. An inertial sensor, comprising:
- a single proof-mass formed in an x-y plane of a device layer, the single proof-mass including a single, central anchor configured to suspend the single proof-mass above a via wafer;
first and second electrode stator frames formed in the x-y plane of the device layer on respective first and second sides of the inertial sensor, the first and second electrode stator frames symmetric about the single, central anchor, and each separately including;
a central platform; and
an anchor configured to fix the central platform to the via wafer;
wherein the anchors for the first and second electrode stator frames are positioned asymmetrically along the central platforms with respect to the single, central anchor.
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Abstract
This document discusses, among other things, an inertial sensor including a single proof-mass formed in an x-y plane of a device layer, the single proof-mass including a single, central anchor configured to suspend the single proof-mass above a via wafer. The inertial sensor further includes first and second electrode stator frames formed in the x-y plane of the device layer on respective first and second sides of the inertial sensor, the first and second electrode stator frames symmetric about the single, central anchor, and each separately including a central platform and an anchor configured to fix the central platform to the via wafer, wherein the anchors for the first and second electrode stator frames are asymmetric along the central platforms with respect to the single, central anchor.
201 Citations
17 Claims
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1. An inertial sensor, comprising:
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a single proof-mass formed in an x-y plane of a device layer, the single proof-mass including a single, central anchor configured to suspend the single proof-mass above a via wafer; first and second electrode stator frames formed in the x-y plane of the device layer on respective first and second sides of the inertial sensor, the first and second electrode stator frames symmetric about the single, central anchor, and each separately including; a central platform; and an anchor configured to fix the central platform to the via wafer; wherein the anchors for the first and second electrode stator frames are positioned asymmetrically along the central platforms with respect to the single, central anchor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An inertial sensor, comprising:
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a single proof-mass formed in an x-y plane of a device layer, the single proof-mass including; a single, central anchor configured to suspend the single proof-mass above a via wafer; x-axis flexure bearings symmetric about the single, central anchor; a first proof-mass frame; a first electrode stator frame on a first side of the single, central anchor, the first electrode stator frame including; a first central platform; first and second inner branches; a plurality of stationary fingers coupled to the first and second inner branches; and a first anchor configured to fix the first electrode stator frame to the via wafer at a first position along the first central platform; and a second electrode stator frame on a second side of the single, central anchor, the second electrode stator frame including; a second central platform; third and fourth inner branches; a plurality of stationary fingers coupled to the third and fourth inner branches; and a second anchor configured to fix the second electrode stator frame to the via wafer at a second position along the second central platform; and wherein the first position along the first central platform and the second position along the second central platform are asymmetric with respect to the single, central anchor. - View Dependent Claims (16, 17)
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Specification