Accoustic resonator having composite electrodes with integrated lateral features
First Claim
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1. A bulk acoustic wave (BAW) resonator device, comprising:
- a bottom composite electrode on a substrate over one of a cavity and an acoustic reflector, the bottom composite electrode including a bottom inner portion and a bottom integrated frame, the bottom integrated frame being arranged between planar top and bottom surfaces of the bottom composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the bottom integrated frame and the bottom inner portion have substantially the same thickness;
a piezoelectric layer on the bottom electrode; and
a top composite electrode on the piezoelectric layer, the top composite electrode including a top inner portion and a top integrated frame, the top integrated frame being arranged between planar top and bottom surfaces of the top composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the top integrated frame and the top inner portion have substantially the same thickness;
wherein the bottom and top integrated frames are positioned adjacent the piezoelectric layer at outer regions of the bottom and top composite electrodes, respectively, and substantially surround the bottom and top inner portions located at center regions of the bottom and top composite electrodes, respectively, andwherein an inner edge of the bottom integrated frame, adjacent the bottom inner portion, is not vertically aligned with an inner edge of the top integrated frame, adjacent the top inner portion.
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Abstract
A bulk acoustic wave (BAW) resonator device includes a bottom electrode on a substrate over one of a cavity and an acoustic reflector, a piezoelectric layer on the bottom electrode, and a top electrode on the piezoelectric layer. At one of the bottom electrode and the top electrode is a composite electrode having an integrated lateral feature, arranged between planar top and bottom surfaces of the composite electrode and configured to create a cut-off frequency mismatch.
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Citations
17 Claims
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1. A bulk acoustic wave (BAW) resonator device, comprising:
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a bottom composite electrode on a substrate over one of a cavity and an acoustic reflector, the bottom composite electrode including a bottom inner portion and a bottom integrated frame, the bottom integrated frame being arranged between planar top and bottom surfaces of the bottom composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the bottom integrated frame and the bottom inner portion have substantially the same thickness; a piezoelectric layer on the bottom electrode; and a top composite electrode on the piezoelectric layer, the top composite electrode including a top inner portion and a top integrated frame, the top integrated frame being arranged between planar top and bottom surfaces of the top composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, wherein the top integrated frame and the top inner portion have substantially the same thickness; wherein the bottom and top integrated frames are positioned adjacent the piezoelectric layer at outer regions of the bottom and top composite electrodes, respectively, and substantially surround the bottom and top inner portions located at center regions of the bottom and top composite electrodes, respectively, and wherein an inner edge of the bottom integrated frame, adjacent the bottom inner portion, is not vertically aligned with an inner edge of the top integrated frame, adjacent the top inner portion. - View Dependent Claims (2, 3, 4, 5)
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6. A thin film bulk acoustic resonator (FBAR), comprising:
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a bottom electrode on a substrate, the bottom electrode being formed of a first material and a second material, wherein the first material has a lower sound velocity than the second material; a piezoelectric layer on the bottom electrode; a top electrode on the piezoelectric layer, the top electrode being formed of the first material and the second material; one of an integrated low velocity frame formed by the first material or an integrated high velocity frame formed by the second material within the bottom electrode at an outer region of the FBAR; and one of an integrated low velocity frame formed by the first material or an integrated high velocity frame formed by the second material within the top electrode at an outer region of the FBAR. - View Dependent Claims (7, 8)
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9. A bulk acoustic wave (BAW) resonator device, comprising:
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a bottom electrode on a substrate over one of a cavity and an acoustic reflector; a piezoelectric layer on the bottom electrode; and a top electrode on the piezoelectric layer; wherein at least one of the bottom electrode and the top electrode comprises a composite electrode having an integrated frame, arranged between planar top and bottom surfaces of the composite electrode and configured to create at least one of a cut-off frequency mismatch and an acoustic impedance mismatch, and wherein the composite electrode comprises an inside layer adjacent the piezoelectric layer and an outside layer adjacent the inside layer, and the integrated frame is located at an outer region of the composite electrode, and extending from the inside layer through the outside layer away from the piezoelectric layer or extending from the outside layer through the inside layer toward the piezoelectric layer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification