Packaged device including cavity package with elastic layer within molding compound
First Claim
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1. A device, comprising:
- a substrate;
a cavity package having a first surface attached to the substrate, the cavity package enclosing an electronic circuit, the cavity package being hermetically sealed;
an elastic layer formed on a second surface of the cavity package, opposite the first surface; and
a molding compound formed on the substrate, encasing the cavity package and the elastic layer,wherein the elastic layer decouples stress between the cavity package and the molding compound encasing the cavity package, at least for maintaining structural integrity of the cavity package, andwherein a Young'"'"'s modulus of the elastic layer is lower than a Young'"'"'s modulus of the molding compound.
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Abstract
A device includes a substrate; a cavity package having a first surface attached to the substrate, the cavity package enclosing an electronic circuit; an elastic layer formed on a second surface of the cavity package, opposite the first surface; and a molding compound formed on the substrate, encasing the cavity package and the elastic layer. The elastic layer decouples stress between the cavity package and the molding compound encasing the cavity package, for maintaining structural integrity of the cavity package and for preventing separation of the cavity package from the substrate.
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Citations
17 Claims
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1. A device, comprising:
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a substrate; a cavity package having a first surface attached to the substrate, the cavity package enclosing an electronic circuit, the cavity package being hermetically sealed; an elastic layer formed on a second surface of the cavity package, opposite the first surface; and a molding compound formed on the substrate, encasing the cavity package and the elastic layer, wherein the elastic layer decouples stress between the cavity package and the molding compound encasing the cavity package, at least for maintaining structural integrity of the cavity package, and wherein a Young'"'"'s modulus of the elastic layer is lower than a Young'"'"'s modulus of the molding compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A microcap die, comprising:
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a base substrate; a plurality of acoustic resonators attached to an inner surface of the base substrate; a lid disposed over the base substrate; a seal-ring disposed between the inner surface of the base substrate and an inner surface of the lid, and surrounding the plurality of acoustic resonators, the seal-ring forming a cavity between the inner surface of the lid and the inner surface of the base substrate containing the plurality of acoustic resonators, wherein the seal-ring provides a hermetic seal for the cavity; an elastic layer formed on one of an outer surface of the lid or an outer surface of the base substrate; and a molding compound formed over the base substrate, the seal-ring, the lid and the elastic layer, wherein the elastic layer reduces stress between the molding compound and at least the seal-ring for maintaining the hermetic seal, and wherein a Young'"'"'s modulus of the elastic layer is lower than a Young'"'"'s modulus of the molding compound. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A device, comprising:
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a substrate; a hermetically sealed cavity package having a first surface attached to the substrate, the cavity package enclosing an electronic circuit; an elastic layer formed on a second surface of the cavity package, opposite the first surface; and a molding compound formed on the substrate, encasing the cavity package and the elastic layer, wherein the elastic layer decouples stress between the cavity package and the molding compound encasing the cavity package, at least for maintaining structural integrity of the cavity package, and wherein the cavity package comprises; a base substrate; a lid; a seal-ring between the base substrate and the lid for bonding the base substrate and the lid, wherein the electronic circuit is positioned in a cavity formed, at least in part, by an internal separation between the base substrate and the lid resulting from the seal-ring; a via formed through one of the lid and the base substrate; a via seal surrounding a base of the via inside the cavity, the via seal further hermetically sealing the electronic circuit positioned in the cavity, wherein the via enables at least electrical connections between the electronic circuit and traces on the substrate, and wherein the via seal comprises a pedestal, which provides separation between the lid and the base wafer, and two metal layers on the pedestal, the two metal layers being joined to each other to provide the at least electrical connections.
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Specification