Method for producing thin film bulk acoustic resonators (FBARs) with different frequencies on the same substrate by subtracting method and apparatus embodying the method
First Claim
Patent Images
1. A method of fabricating resonators on a substrate, the method comprising:
- fabricating a bottom electrode layer on the substrate;
fabricating a piezoelectric (PZ) layer over the bottom electrode layer;
fabricating a top electrode layer over the PZ layer, the top electrode layer having a first thickness;
partially etching a selected area of the top electrode layer so that the top electrode layer has a second thickness at the selected area; and
patterning, after the step of partially etching the selected area, the top electrode layer to form resonators such that a first resonator is created having a top electrode having the second thickness and a second resonator is created having a top electrode having the first thickness.
13 Assignments
0 Petitions
Accused Products
Abstract
A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. An FBAR is fabricated on a substrate by reducing mass from a top electrode layer. For a substrate having multiple resonators, mass is reduced from only selected resonator to provide resonators having different resonance frequencies on the same substrate.
132 Citations
18 Claims
-
1. A method of fabricating resonators on a substrate, the method comprising:
-
fabricating a bottom electrode layer on the substrate;
fabricating a piezoelectric (PZ) layer over the bottom electrode layer;
fabricating a top electrode layer over the PZ layer, the top electrode layer having a first thickness;
partially etching a selected area of the top electrode layer so that the top electrode layer has a second thickness at the selected area; and
patterning, after the step of partially etching the selected area, the top electrode layer to form resonators such that a first resonator is created having a top electrode having the second thickness and a second resonator is created having a top electrode having the first thickness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of fabricating a resonator on a substrate, the method comprising:
-
depositing a bottom electrode on the substrate wherein a first section of the bottom electrode is a first bottom electrode and a second section of the bottom electrode is a second bottom electrode;
depositing a piezoelectric (PZ) layer over the first bottom electrode layer;
depositing a top electrode having a first thickness;
etching a portion of the top electrode layer, the portion above the first bottom electrode, such that the portion of the top electrode layer has a second thickness; and
patterning, following the step of etching, the top electrode layer to form a first top electrode above the first bottom electrode and a second top electrode above the second bottom electrode such that a first resonator is formed having the first bottom electrode and the first top electrode with a first portion of the PZ layer and a second resonator is formed having the second bottom electrode and the second top electrode with a second portion of the PZ layer. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
Specification