Abstract: A package that includes a first filter device and a second filter device coupled to the first filter device. The first filter device includes a first substrate comprising a first piezoelectric material, and a first metal layer coupled to a first surface of the first substrate. The second filter device includes a second substrate comprising a second piezoelectric material, and a second metal layer coupled to a first surface of the first substrate. The package includes a first pillar interconnect configured to be electrically coupled to the first metal layer of the first filter device, where the first pillar interconnect extends through the second filter device. The package further includes a second pillar interconnect configured to be electrically coupled to the second metal layer of the second filter device.

Abstract: An apparatus and method for making an acoustic filter package where the apparatus includes a base layer; a support layer disposed on the base layer; a piezoelectric structure disposed on the support layer; wherein the piezoelectric structure comprises: a piezoelectric layer; a top electrode on a top surface of the piezoelectric layer; a bottom electrode on a bottom surface of the piezoelectric layer; a contact pad coupled to the bottom electrode that extends through an opening in the piezoelectric layer and is coupled to the bottom electrode or the top electrode; and a corrosion resistant pad disposed on the contact pad; and a capping structure disposed on the piezoelectric structure.

Abstract: Certain aspects of the present disclosure can be implemented in an electroacoustic device. The electroacoustic device generally includes a substrate and one or more resonator structures disposed above the substrate. In some cases, each resonator structure of the one or more resonator structures includes a bulk acoustic resonator, an acoustic mirror disposed below the bulk acoustic resonator, and one or more porous material layers disposed below the acoustic mirror and above the substrate.

Abstract: An apparatus and method for making an acoustic filter package where the apparatus includes a base layer; a support layer disposed on the base layer; a piezoelectric structure disposed on the support layer; wherein the piezoelectric structure comprises: a piezoelectric layer; a top electrode on a top surface of the piezoelectric layer; a bottom electrode on a bottom surface of the piezoelectric layer; a contact pad coupled to the bottom electrode that extends through an opening in the piezoelectric layer and is coupled to the bottom electrode or the top electrode; and a corrosion resistant pad disposed on the contact pad; and a capping structure disposed on the piezoelectric structure.

Abstract: A bump pad enclosure providing an improved reliability of a bump connection is provided. The bump pad enclosure comprises an electrode pad, a UBM and a first shield. The first shield covers at least a first perimeter area of the electrode pad. The first shield is provided and configured to shield the first perimeter area from a detrimental influence of the environment.

Abstract: In certain aspects, a chip includes an acoustic resonator, and a mirror under the acoustic resonator. The mirror includes a first plurality of porous silicon layers, and a second plurality of porous silicon layers, wherein the mirror alternates between the first plurality of porous silicon layers and the second plurality of porous silicon layers, and each of the first plurality of porous silicon layers has a higher porosity than each of the second plurality of porous silicon layers.

Abstract: A package that includes a first filter device and a second filter device coupled to the first filter device. The first filter device includes a first substrate comprising a first piezoelectric material, and a first metal layer coupled to a first surface of the first substrate. The second filter device includes a second substrate comprising a second piezoelectric material, and a second metal layer coupled to a first surface of the first substrate. The package includes a first pillar interconnect configured to be electrically coupled to the first metal layer of the first filter device, where the first pillar interconnect extends through the second filter device. The package further includes a second pillar interconnect configured to be electrically coupled to the second metal layer of the second filter device.