Silicon base plate with low parasitic electrical interference for sensors
First Claim
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1. A method of forming a baseplate for a microgyroscope comprising:
- forming a substrate layer;
covering the substrate layer with a epilayer;
positioning a dielectric layer on the epilayer; and
isolating a plurality of metal electrodes from the substrate layer.
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Abstract
A microgyroscope has a baseplate made of the same material as the rest of the microgyroscope. The baseplate is a silicon baseplate having a heavily p-doped epilayer covered by a thick dielectric film and metal electrodes. The metal electrodes are isolated from the ground plane by the dielectric. This provides very low parasitic capacitive coupling between the electrodes. The thick dielectric reduces the capacitance between the electrodes and the ground plane.
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Citations
12 Claims
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1. A method of forming a baseplate for a microgyroscope comprising:
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forming a substrate layer;
covering the substrate layer with a epilayer;
positioning a dielectric layer on the epilayer; and
isolating a plurality of metal electrodes from the substrate layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A microgyroscope comprising:
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a substrate;
an epilayer which covers the substrate;
a dielectric layer formed over the epilayer; and
a plurality of metal electrodes formed on the dielectric layer, wherein the dielectric layer isolates the plurality of metal electrodes from the substrate. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification