Semiconductor Wafer Shielding for Integrated Circuit EMI Protection
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Solution Overview
Problem
Integrating multiple functions in a single electronic circuit, such as a cell phone's transceiver and power amplifier circuits, poses a challenge in protecting components from electromagnetic disturbances, as conventional methods like metal covers are incompatible with manufacturing processes and result in increased bulk.
Innovation Solution
A device comprising a semiconductor wafer with a conductive layer connected to a support via conductive pillars, with an insulating region between, forms a metal cage around integrated circuit portions to shield against electromagnetic interference, compatible with existing manufacturing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal cover is provided for each elementary electronic circuit to protect against electromagnetic disturbances, then electromagnetic protection is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the electromagnetic protection function with the existing semiconductor wafer structure by integrating a conductive layer directly onto the wafer surface. This eliminates the need for separate metal covers for each circuit, as the conductive layer provides unified electromagnetic shielding across multiple circuit portions while maintaining manufacturing compatibility.
Solution Approach 2:
The semiconductor wafer is given multiple functions: it serves as both the substrate for mounting integrated circuits and as the base for the conductive layer that provides electromagnetic protection. This multi-functional approach eliminates the need for additional dedicated protection structures, reducing overall device complexity.
2Reliability
If metal covers are provided to protect integrated circuits from electromagnetic disturbances, then electromagnetic protection is improved, but the device bulk increases
Solution Approach 1:
The conductive layer is nested directly onto the semiconductor wafer surface, utilizing the existing wafer volume rather than adding external metal covers. This nested integration provides electromagnetic shielding without increasing the overall device bulk, as the protection structure is embedded within the existing device footprint.
3Reliability
If metal covers are used to protect each elementary electronic circuit, then electromagnetic protection is improved, but compatibility with conventional manufacturing methods deteriorates
Solution Approach 1:
The electromagnetic protection function is merged into the semiconductor wafer fabrication process itself. The conductive layer is deposited and patterned using standard semiconductor manufacturing techniques during wafer production, eliminating the need for post-assembly metal cover installation and ensuring compatibility with conventional manufacturing workflows.
4Adaptability or versatility
If multiple integrated circuits are integrated on the same package, then functional integration is improved, but electromagnetic interference between components increases
Solution Approach 1:
The conductive layer is patterned to provide localized electromagnetic shielding over specific circuit portions that are sensitive to interference. This selective protection allows multiple integrated circuits to coexist on the same package with reduced mutual interference, as the shielding is applied precisely where needed rather than uniformly across the entire device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively protects integrated circuits from electromagnetic disturbances without the need for additional metal covers, reducing bulk and maintaining compatibility with conventional manufacturing processes.
Implementation Method 1
the device comprises a wafer of a semiconductor material covered with a conductive layer arranged parallel to the support, the wafer being connected to the support by conductive pillars distributed around each circuit portion and in contact with the conductive layer
Data Source
AI summary
A device for protecting an electronic circuit comprising a support to which are attached at least two circuit portions, each comprising at least one integrated circuit chip. The device comprises a wafer of a semiconductor material covered with a conductive layer arranged parallel to the support, the wafer being connected to the support by conductive pillars distributed around each circuit portion and in contact with the conductive layer.