Patent ID: 6518860
Filing Date: 2003-02-11
Classification: H03H,Y10T

Abstract:
A method of fabricating a plurality of bulk acoustic wave (BAW) resonators on a single substrate, the plurality of BAW resonators including BAW resonators from at least two different filters having substantially different resonant center frequencies, the plurality of BAW resonators thus including BAW resonators having substantially different resonant frequencies, the method comprising the steps of:a) providing a substrate having an upper facing surface; b) depositing an isolation structure on the upper facing surface of the substrate; c) depositing a first metallic layer on the isolation structure, the first metallic layer serving as a bottom electrode; and d) depositing piezolayer material on the bottom electrode so as to have thicknesses corresponding to each of the different resonant frequencies, each different thickness located in a location where a resonator having a resonant frequency corresponding to the thickness is to be located; wherein the step of depositing piezolayer material on the bottom electrode includes a step of incrementally adjusting the thickness of the piezolayer where at least one electrode is to be located.