Spurious mode suppression in bulk acoustic wave resonator
First Claim
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1. A bulk acoustic wave (BAW) resonator comprising:
- a border region that is located between an inactive region and an active region, the border region, the inactive region, and the active region intersecting a first axis;
a substrate in the inactive region, border region, and active region, the substrate to include silicon (Si), the substrate parallel to the first axis;
a mirror layer coupled with the substrate, the mirror layer disposed in the inactive region, border region, and active region and including a plurality of layers of Silicon Oxide (SiO2) and a plurality of layers of Tungsten (W);
a bottom electrode layer coupled with the mirror layer, the bottom electrode layer disposed in the border region and the active region and including a layer of Tungsten (W) and a layer of Aluminum-Copper (AlCu);
a piezoelectric layer coupled with the bottom electrode layer, the piezoelectric layer disposed in the border region and the active region and including Aluminum Nitride (AlN);
a top electrode layer coupled with the piezoelectric layer, the top electrode layer disposed in the border region and the active region and including a layer of Tungsten (W) and a layer of Aluminum-Copper (AlCu); and
a planarization layer coupled with the mirror layer, the planarization layer adjacent to the piezoelectric layer, the planarization layer and the piezoelectric layer intersecting the first axis, the planarization layer being disposed in the inactive region and including a planarization material.
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Abstract
Embodiments provide a solidly-mounted bulk acoustic wave (BAW) resonator and method of making same. In embodiments, the BAW resonator may include a planzarization portion in an inactive region of the BAW resonator that is coplanar with a piezoelectric layer of the BAW resonator in an active region of the BAW restonator. Other embodiments may be described and claimed.
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Citations
21 Claims
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1. A bulk acoustic wave (BAW) resonator comprising:
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a border region that is located between an inactive region and an active region, the border region, the inactive region, and the active region intersecting a first axis; a substrate in the inactive region, border region, and active region, the substrate to include silicon (Si), the substrate parallel to the first axis; a mirror layer coupled with the substrate, the mirror layer disposed in the inactive region, border region, and active region and including a plurality of layers of Silicon Oxide (SiO2) and a plurality of layers of Tungsten (W); a bottom electrode layer coupled with the mirror layer, the bottom electrode layer disposed in the border region and the active region and including a layer of Tungsten (W) and a layer of Aluminum-Copper (AlCu); a piezoelectric layer coupled with the bottom electrode layer, the piezoelectric layer disposed in the border region and the active region and including Aluminum Nitride (AlN); a top electrode layer coupled with the piezoelectric layer, the top electrode layer disposed in the border region and the active region and including a layer of Tungsten (W) and a layer of Aluminum-Copper (AlCu); and a planarization layer coupled with the mirror layer, the planarization layer adjacent to the piezoelectric layer, the planarization layer and the piezoelectric layer intersecting the first axis, the planarization layer being disposed in the inactive region and including a planarization material. - View Dependent Claims (2, 3, 4)
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5. A bulk acoustic wave (BAW) resonator comprising:
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a piezoelectric layer that includes a piezoelectric material and vertically located between a first electrode and a second electrode in an active region and a border region of the BAW resonator; and a planarization layer that includes a planarization material that is different than the piezoelectric material and is located horizontally adjacent to the piezoelectric layer in an inactive region of the BAW resonator that is horizontally adjacent to the border region of the BAW resonator, the planarization layer to improve suppression of spurious resonances of the BAW resonator. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A bulk acoustic wave (BAW) resonator comprising:
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an active region that is coupled with and adjacent to a border region, the active region and the border region intersecting a first axis; an inactive region that is coupled with and adjacent to the border region on a side of the border region opposite the active region; a piezoelectric layer located between a top electrode and a bottom electrode, the piezoelectric layer, the top electrode, and the bottom electrode intersecting a second axis that is perpendicular to the first axis in the active region and the border region; a mirror layer coupled with the piezoelectric layer, the mirror layer perpendicular to and intersecting the second axis; and a planarization layer in the inactive region that is adjacent to and coupled with the piezoelectric layer, the planarization layer and the piezoelectric layer intersecting the first axis. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification