Patent ID: 6379987
Filing Date: 2002-04-30
Classification: H03H

Abstract:
A method of manufacturing a hybrid integrated circuit comprising a semiconductor element and a piezoelectric filter which are provided next to each other on a carrier substrate, with the semiconductor element comprising semiconductor zones provided in a layer of silicon, and the piezoelectric filter comprising an acoustic resonator formed on an acoustic reflector layer, said acoustic resonator including a layer of a piezoelectric material, a first electrode situated between this layer and the acoustic reflector layer, and, on the other side of the layer of piezoelectric material, a second electrode situated opposite the first electrode, characterized in that the semiconductor element is formed at a first side of an auxiliary slice of silicon, after which the layer of piezoelectric material supporting the first electrode is provided, at the same first side, on the auxiliary slice, whereafter the structure thus formed is provided over its free surface area with an acoustic reflector layer and, subsequently, is attached to the carrier substrate with this layer, whereafter silicon is removed from the second side of the auxiliary slice at the location of the acoustic resonator.