Method of providing differential frequency adjusts in a thin film bulk acoustic resonator (FBAR) filter and apparatus embodying the method
First Claim
Patent Images
1. An apparatus comprising:
- a substrate;
a first resonator fabricated on the substrate, the first resonator comprising a first bottom electrode;
a first top electrode;
a first piezoelectric (PZ) portion sandwiched between the first bottom electrode and the first top electrode, the first PZ portion being a portion of a core PZ layer;
an additional PZ layer also sandwiched between the first bottom electrode and the first top electrode;
a second resonator fabricated on the substrate, the second resonator comprising a second bottom electrode;
a second top electrode; and
a second PZ portion sandwiched between the second bottom electrode and the second top electrode such that the first resonator is fabricated having higher mass than the second resonator.
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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 mass loading piezoelectric (PZ) layer between two electrodes. For a substrate having multiple resonators, only selected resonator is mass loaded to provide resonators having different resonance frequencies on the same substrate.
128 Citations
15 Claims
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1. An apparatus comprising:
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a substrate;
a first resonator fabricated on the substrate, the first resonator comprising a first bottom electrode;
a first top electrode;
a first piezoelectric (PZ) portion sandwiched between the first bottom electrode and the first top electrode, the first PZ portion being a portion of a core PZ layer;
an additional PZ layer also sandwiched between the first bottom electrode and the first top electrode;
a second resonator fabricated on the substrate, the second resonator comprising a second bottom electrode;
a second top electrode; and
a second PZ portion sandwiched between the second bottom electrode and the second top electrode such that the first resonator is fabricated having higher mass than the second resonator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a substrate;
a first resonator fabricated on the substrate, the first resonator comprising a first bottom electrode;
a first top electrode;
a first piezoelectric (PZ) portion;
a second resonator fabricated on the substrate, the second resonator comprising a second bottom electrode;
a second top electrode; and
a second PZ portion, the second PZ portion having a thickness less than thickness of the first PZ portion. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification