Acoustic resonator having guard ring
First Claim
Patent Images
1. A bulk acoustic wave (BAW) resonator structure, comprising:
- a bottom electrode disposed over a substrate;
a piezoelectric layer disposed over the bottom electrode;
a top electrode disposed over the piezoelectric layer;
a guard ring disposed around a perimeter of an active region corresponding to an overlap of the top electrode, the piezoelectric layer, and the bottom electrode; and
a planarization layer disposed over the piezoelectric layer and between the top electrode and the guard ring.
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Abstract
A bulk acoustic wave (BAW) resonator structure comprises a first electrode disposed over a substrate, a piezoelectric layer disposed over the first electrode, a second electrode disposed over the first piezoelectric layer, and a guard ring structure formed around a perimeter of an active region corresponding to an overlap of the first electrode, the first piezoelectric layer, and the second electrode.
126 Citations
45 Claims
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1. A bulk acoustic wave (BAW) resonator structure, comprising:
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a bottom electrode disposed over a substrate; a piezoelectric layer disposed over the bottom electrode; a top electrode disposed over the piezoelectric layer; a guard ring disposed around a perimeter of an active region corresponding to an overlap of the top electrode, the piezoelectric layer, and the bottom electrode; and a planarization layer disposed over the piezoelectric layer and between the top electrode and the guard ring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A bulk acoustic wave (BAW) resonator structure, comprising:
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a bottom electrode disposed over a substrate; a piezoelectric layer disposed over the bottom electrode; a top electrode disposed over the piezoelectric layer, the top electrode comprising a first electrically conductive material having with a first thickness; a guard ring disposed around a perimeter of an active region corresponding to an overlap of the bottom electrode, the piezoelectric layer, and the top electrode, the guard ring comprising an electrically conductive material disposed over the piezoelectric layer with a second thickness greater than the first thickness, wherein the guard ring comprises a composite of metal and dielectric materials.
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21. A bulk acoustic wave (BAW) resonator structure, comprising:
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a bottom electrode disposed over a substrate, and electrically connected to ground; a piezoelectric layer disposed over the bottom electrode; a top electrode disposed over the piezoelectric layer, the top electrode comprising a first electrically conductive material having a first thickness, and electrically configured to receive a time-varying input signal; a guard ring disposed over the piezoelectric layer adjacent to the top electrode, and around a perimeter of an active region corresponding to an overlap of the bottom electrode, the piezoelectric layer, and the top electrode, the guard ring comprising an electrically conductive material electrically connected to ground, and disposed over the piezoelectric layer with a second thickness greater than the first thickness. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A bulk acoustic wave (BAW) resonator structure, comprising:
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a bottom electrode disposed over a substrate; a piezoelectric layer disposed over the bottom electrode; a top electrode disposed over the piezoelectric layer, the top electrode comprising a first electrically conductive material having a first thickness; a first guard ring disposed over a first side of the piezoelectric layer around a perimeter of the top electrode, and around a perimeter of an active region corresponding to an overlap of the bottom electrode, the piezoelectric layer, and the top electrode, the first guard ring comprising an electrically conductive material disposed over the piezoelectric layer with a second thickness greater than the first thickness; and a second guard ring disposed beneath a second side of the piezoelectric layer around a perimeter of the bottom electrode, wherein the first and top electrodes have substantially aligned edges, and the first and second guard rings have substantially aligned edges. - View Dependent Claims (31, 32, 33)
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34. A bulk acoustic wave (BAW) resonator structure, comprising:
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a bottom electrode disposed over a substrate; a piezoelectric layer disposed over the bottom electrode; a top electrode disposed over the piezoelectric layer, the top electrode comprising a first electrically conductive material having a first acoustic velocity; a guard ring disposed around a perimeter of an active region corresponding to an overlap of the bottom electrode, the piezoelectric layer, and the top electrode, the guard ring comprising a second electrically conductive material disposed over the piezoelectric layer and having a second acoustic velocity lower than the first acoustic velocity. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification