Saw filter having planar barrier layer and method of making
First Claim
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1. A surface acoustic wave (SAW) filter comprising:
- a piezoelectric substrate;
a planar barrier layer disposed above the piezoelectric substrate; and
at least one metal conductor disposed in at least one trench in the planar barrier layer,wherein each of the at least one metal conductors further comprises a stacked conductor including;
a diffusion barrier layer disposed above each of the at least one metal conductors; and
a metal layer disposed above the diffusion barrier layer,wherein the metal layer is substantially horizontally aligned with the diffusion barrier layer, andwherein the at least one metal conductor is buried in the piezoelectric substrate and the planar barrier layer.
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Abstract
Disclosed herein is a surface acoustic wave (SAW) filter and method of making the same. The SAW filter includes a piezoelectric substrate; a planar barrier layer disposed above the piezoelectric substrate, and at least one conductor buried in the piezoelectric substrate and the planar barrier layer.
29 Citations
13 Claims
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1. A surface acoustic wave (SAW) filter comprising:
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a piezoelectric substrate; a planar barrier layer disposed above the piezoelectric substrate; and at least one metal conductor disposed in at least one trench in the planar barrier layer, wherein each of the at least one metal conductors further comprises a stacked conductor including; a diffusion barrier layer disposed above each of the at least one metal conductors; and a metal layer disposed above the diffusion barrier layer, wherein the metal layer is substantially horizontally aligned with the diffusion barrier layer, and wherein the at least one metal conductor is buried in the piezoelectric substrate and the planar barrier layer. - View Dependent Claims (2, 3, 4, 5, 6, 8)
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7. A surface acoustic wave (SAW) filter comprising:
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a piezoelectric substrate; a first SiO2 planar barrier layer disposed above the piezoelectric substrate; at least one Cu conductor buried in the planar barrier layer and the piezoelectric substrate; a diffusion barrier layer disposed above each of the at least one Cu conductors; at least one Al conductor disposed above the diffusion barrier layer; and a second SiO2 layer disposed above the first SiO2 planar barrier layer and the at least one Al conductor.
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9. A surface acoustic wave (SAW) filter comprising:
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a piezoelectric substrate; a planar barrier layer disposed above the piezoelectric substrate; and at least one metal conductor disposed in at least one trench in the planar barrier layer, wherein each of the at least one metal conductors further comprises a stacked conductor in a damascene configuration, including; a diffusion barrier layer disposed above the at least one metal conductor; and a metal layer disposed above the diffusion barrier layer, wherein the metal conductor, the diffusion barrier layer, and the metal layer are self-aligned, and wherein the at least one metal conductor is buried in the piezoelectric substrate and the planar barrier layer. - View Dependent Claims (10, 11, 12, 13)
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Specification