Stacked bulk acoustic resonator
First Claim
1. A stacked bulk acoustic resonator, comprising:
- a first piezoelectric layer stacked on a first electrode;
a second electrode stacked on the first piezoelectric layer;
a second piezoelectric layer stacked on the second electrode;
a third electrode stacked on the second piezoelectric layer;
an inner raised region formed on an inner portion of a surface of at least one of the first, second and third electrodes; and
an outer raised region formed along an outer perimeter of the surface of the at least one of the first, second and third electrodes, the outer raised region surrounding the inner raised region and defining a gap between the inner raised region and the outer raised region.
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Abstract
A stacked bulk acoustic resonator includes a first piezoelectric layer stacked on a first electrode, a second electrode stacked on the first piezoelectric layer; a second piezoelectric layer stacked on the second electrode, and a third electrode stacked on the second piezoelectric layer. The stacked bulk acoustic resonator further includes an inner raised region formed in an inner portion on a surface of at least one of the first, second and third electrodes, and an outer raised region formed along an outer perimeter on the surface of the at least one of the first, second or third electrodes. The outer raised region surrounds the inner raised region and defines a gap between the inner raised region and the outer raised region.
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Citations
20 Claims
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1. A stacked bulk acoustic resonator, comprising:
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a first piezoelectric layer stacked on a first electrode; a second electrode stacked on the first piezoelectric layer; a second piezoelectric layer stacked on the second electrode; a third electrode stacked on the second piezoelectric layer; an inner raised region formed on an inner portion of a surface of at least one of the first, second and third electrodes; and an outer raised region formed along an outer perimeter of the surface of the at least one of the first, second and third electrodes, the outer raised region surrounding the inner raised region and defining a gap between the inner raised region and the outer raised region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A stacked bulk acoustic resonator, comprising:
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a plurality of piezoelectric layers; and an electrode stacked on a top surface of one of the plurality of piezoelectric layers, the electrode having at least one of an inner raised region and an outer raised region extending from a top surface of the electrode, wherein the inner raised region is formed in an inner portion of the top surface of the electrode and the outer raised region is formed along an outer perimeter of the top surface of the electrode. - View Dependent Claims (16, 17)
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18. A stacked bulk acoustic resonator, comprising:
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a first piezoelectric layer formed on a first electrode; a second electrode formed on the first piezoelectric layer; a second piezoelectric layer formed on the second electrode; an embedded protrusion formed on the second piezoelectric layer along an outer perimeter of the second piezoelectric layer; a third electrode formed on the second piezoelectric layer and the embedded protrusion, a portion of the third electrode covering the embedded protrusion extending from the third electrode to form an outer raised region along an outer perimeter of the third electrode; and an inner raised region formed in an inner portion of the third electrode, wherein a gap is defined between the inner raised region and the outer raised region. - View Dependent Claims (19, 20)
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Specification