Dielectric stack, an isolator device and method of forming an isolator device
First Claim
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1. An isolator comprising:
- a first layer of a first dielectric material formed adjacent a substrate;
a second layer of the first dielectric material formed on the first layer, wherein the second layer is delimited by a periphery and at least some parts of the second layer do not extend to or beyond a periphery of the first layer;
a layer of a second dielectric material formed over an uppermost one of the first and second layers of the first dielectric material, wherein the layer of the second dielectric material has a higher permittivity than the first dielectric material.
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Abstract
An isolator device is provided comprising a body of first dielectric material between the first and second conductors, such as primary and secondary coils of a micro-transformer. A region of second dielectric material is provided between the body of first dielectric material and at least one of the first and second electrodes, wherein the second dielectric material has a higher relative permittivity than the first dielectric material. This provides enhances ability to withstand the Electric fields generated at the edge of a conductor. The body of the first dielectric can be tapered to provide stress relief to prevent the second dielectric material developing stress cracks.
47 Citations
18 Claims
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1. An isolator comprising:
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a first layer of a first dielectric material formed adjacent a substrate; a second layer of the first dielectric material formed on the first layer, wherein the second layer is delimited by a periphery and at least some parts of the second layer do not extend to or beyond a periphery of the first layer; a layer of a second dielectric material formed over an uppermost one of the first and second layers of the first dielectric material, wherein the layer of the second dielectric material has a higher permittivity than the first dielectric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An isolator device comprising:
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first and second conductors; a layer of first dielectric material between the first and second conductors; and at least one region of second dielectric material between the layer of first dielectric material and at least the second conductor; wherein the second dielectric material has a higher relative permittivity than the first dielectric material and wherein one of the layer of the first dielectric and the region of second dielectric material includes a stress relief structure. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification