Patent ID: 8479363
Filing Date: 2013-07-09
Classification: H03H,Y10T

Abstract:
1. A method for manufacturing an acoustically coupled device comprising a stack having a first resonator, a second resonator and a decoupler, the decoupler formed between the first resonator and the second resonator, each of the first and second resonators having a piezoelectric layer sandwiched between a bottom electrode and a top electrode, the method comprising the steps of: (a) providing a substrate having a first sacrificial layer formed in or on a selected portion of the substrate; (b) forming the first resonator of a first stack over the sacrificial layer on the selected portion of the substrate and the first resonator of a second stack on the substrate, respectively, such that the first resonators of the first and second stacks are distanced; (c) forming an air cavity underlying the second stack; (d) performing a first measurement on the second stack; (e) trimming a top electrode of the first resonator of the first stack according to the first measurement; (f) forming the decoupler on the first resonator of each of the first and second stacks, respectively; (g) forming the second resonator on the decoupler of each of the first and second stacks, respectively; (h) performing a second measurement on the first stack or the second stack; and (i) trimming the top electrode of the second resonator of the first stack according to the second measurement, so as to achieve a desired device performance.