Shielded electronic component assembly and method for making the same
First Claim
1. A shielded electronic component assembly comprising:
- a wiring substrate having a plurality of conductive signal traces and at least one ground element formed on a surface thereof;
a semiconductor device mounted to the wiring substrate and electrically coupled to the plurality of signal traces;
a conformal insulating layer formed over the semiconductor device and over the signal traces, such that a portion of the at least one ground element is uncovered by the insulating layer; and
a conformal shielding layer deposited over the insulating layer and in contact with the uncovered portion of the ground element, the shielding layer comprising;
a precursor material; and
a first plurality of filler particles selected to attenuate electromagnetic signal frequencies within a first range of frequencies; and
a second plurality of filler particles selected to attenuate electromagnetic signal frequencies within a second range of frequencies;
wherein the first and second ranges of frequencies are at least partially exclusive.
18 Assignments
0 Petitions
Accused Products
Abstract
Electronic components are shielded from electromagnetic interference (EMI) by one or more conformal layers filled with selected filler particulars for attenuate specific EMI frequencies or a general range of frequencies. Shielding is accomplished through the use of a single general purpose shielding layer, or through a series of shielding layers for protecting more specific EMI frequencies. In a multilayer embodiment, a semiconductor device (50) is mounted on a printed circuit board substrate (16) as a portion of an electronic component assembly (10). A conformal insulating coating (24) is applied over the device to provide electrical insulation of signal paths (e.g. leads 54 and conductive traces 18) from subsequently deposited conductive shielding layers. One or more shielding layers (60, 62, and 64) are deposited, and are in electrical contact with a ground ring (56). In a preferred embodiment, the ground connections for the shield layers are separate from those used for power distribution within the devices.
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Citations
27 Claims
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1. A shielded electronic component assembly comprising:
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a wiring substrate having a plurality of conductive signal traces and at least one ground element formed on a surface thereof; a semiconductor device mounted to the wiring substrate and electrically coupled to the plurality of signal traces; a conformal insulating layer formed over the semiconductor device and over the signal traces, such that a portion of the at least one ground element is uncovered by the insulating layer; and a conformal shielding layer deposited over the insulating layer and in contact with the uncovered portion of the ground element, the shielding layer comprising; a precursor material; and a first plurality of filler particles selected to attenuate electromagnetic signal frequencies within a first range of frequencies; and a second plurality of filler particles selected to attenuate electromagnetic signal frequencies within a second range of frequencies; wherein the first and second ranges of frequencies are at least partially exclusive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A shielded electronic component assembly comprising:
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a wiring substrate having a plurality of signal members and a ground member; a semiconductor device mounted on the substrate and electrically coupled to the plurality of signal members; an insulative conformal coating formed over the semiconductor device and the plurality of signal members; a first conformal shielding layer formed over the insulating layer and electrically coupled to a first portion of the ground member, wherein the first conformal shielding layer comprises a polymer precursor material filled with particles selected to attenuate a first range of electromagnetic signal frequencies; and a second conformal shielding layer formed over the first conformal shielding layer and electrically coupled to the ground member, wherein the second conformal shielding layer comprises a polymer precursor material filled with particles selected to attenuate a second range of electromagnetic signal frequencies, wherein the first and second ranges of frequencies are at least partially exclusive. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A shielded electronic component assembly comprising:
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a semiconductor device to be shielded from a range of electromagnetic frequencies; a reference potential source; a housing enclosing the semiconductor device within the assembly, the housing having a plurality of interior surfaces; a conformal shielding layer formed on all interior surfaces of the housing and electrically connected to the reference potential source, the conformal shielding layer comprising; a first polymer precursor material; and a first plurality of filler particles of a first material within the precursor material which attenuate a first portion of the range of the electromagnetic frequencies; and a second plurality of filler particles of a second material within the precursor material which attenuate a second portion of the range of electromagnetic frequencies. - View Dependent Claims (21, 22, 23)
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24. A method for shielding an electronic component from a range of electromagnetic frequencies comprising the steps of:
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providing a wiring substrate having a plurality of signal traces and at least one ground element formed on a surface thereof; providing an electronic component; mounting the electronic component to the wiring substrate such that the component is electrically coupled to the plurality of signal traces; depositing an insulative coating over the electronic component and the plurality of signal traces; providing a first shielding material, wherein the first shielding material comprises; a first precursor material; and a first plurality of filler particles selected to attenuate at least a first portion of the range of electromagnetic frequencies; and depositing the first shielding material on the insulative coating and over the electronic component such that the shielding layer is in electrical contact with the at least one ground element. - View Dependent Claims (25, 26, 27)
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Specification