Segmented Conductive Plane for RF Shielding in Integrated Circuits
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Solution Overview
Problem
Integrated circuits face electromagnetic interference issues due to densely packed circuits, which worsen with miniaturization, especially in high-performance RF or analog signals, and existing shielding methods increase costs and manufacturing complexity by requiring multiple chips and external Faraday cages.
Innovation Solution
The integration of a segmented conductive plane within the IC using through substrate vias and conductors, spaced uniformly to maintain a common potential, effectively shields electromagnetic radiation and reduces interference between RF signal conditioning circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circuits are densely packed on an integrated circuit die to reduce system cost and size, then manufacturing cost and system size are reduced, but electromagnetic interference between adjacent circuits increases
Solution Approach 1:
The conductive plane is divided into multiple segmented regions, each associated with a different circuit element. These segmented conductive planes are electrically isolated from each other while remaining part of the same physical layer, allowing individual shielding for each circuit without requiring complete isolation structures
Solution Approach 2:
The shielding structure is implemented within the planar dimension of the integrated circuit substrate rather than requiring three-dimensional external Faraday cages. The conductive planes are embedded in the substrate layers, providing electromagnetic shielding in the horizontal plane while maintaining a flat, integrated structure
2Object-affected harmful factors
If external Faraday cages are used to shield each circuit package, then electromagnetic interference is reduced, but system cost and manufacturing complexity increase
Solution Approach 1:
Multiple shielding functions are merged into a single integrated substrate structure. The conductive planes are formed as part of the substrate's internal layers, combining the substrate's structural function with the electromagnetic shielding function, eliminating the need for separate external shielding components
Solution Approach 2:
The segmented conductive planes act as intermediary shielding structures between adjacent circuit elements. Rather than using external Faraday cages, the substrate itself provides the shielding medium through its internal conductive plane layers, which are positioned between and around circuit elements to block electromagnetic interference
3Length of moving object
If the substrate is used as a conduit for signal passage, then circuit miniaturization is enabled, but noise propagation between circuits increases
Solution Approach 1:
Different regions of the substrate are assigned different electromagnetic properties through the selective placement of segmented conductive planes. Each local region provides shielding tailored to its specific circuit elements, allowing the substrate to simultaneously support miniaturization while providing localized noise suppression where needed
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 provides effective electromagnetic shielding within the IC, reducing signal interference and maintaining signal integrity while minimizing the need for multiple chips and external shielding, thus lowering costs and manufacturing complexity.
Implementation Method 1
The integration of a segmented conductive plane within the IC using through substrate vias and conductors, spaced uniformly to maintain a common potential, effectively shields electromagnetic radiation and reduces interference between RF signal conditioning circuits
Data Source
AI summary
An integrated circuit is disclosed having through silicon vias spaced apart one from another and conductors, each coupled to one or more of the through silicon vias, the conductors in aggregate in use forming a segmented conductive plane maintained at a same potential and forming an electromagnetic shield.