Inductive Link Circuit Layout for Edge Seal Ring Isolation
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Solution Overview
Problem
In multi-channel inductive communication link systems, unwanted inductive coupling between coils and edge seal rings in integrated circuits leads to electromagnetic interference, especially in smaller devices where coil proximity to the edge seal ring increases interference, affecting data transmission reliability.
Innovation Solution
Implementing electrically conductive connectors that split the area defined by the edge seal ring into separate regions, providing an alternative path for induced currents to reduce channel-to-channel interference without altering coil spacing or cutting the seal ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If coils are placed closer to the edge seal ring to reduce die size, then die area is reduced, but electromagnetic interference increases
Solution Approach 1:
An electrically conductive connector is introduced as an intermediary element between the coils and the edge seal ring. This connector provides a controlled current path that shields the coils from electromagnetic interference generated by the seal ring, allowing close placement while maintaining signal integrity
Solution Approach 2:
The edge seal ring structure is segmented by introducing conductive connectors that create separate regions. This segmentation divides the continuous seal ring into isolated sections, confining induced currents to specific areas and preventing them from affecting all coils uniformly
2Object-affected harmful factors
If traditional shielding methods are used to reduce interference, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The electrically conductive connector serves multiple functions simultaneously: it provides electrical connection for signal transmission, acts as a shield against electromagnetic interference, and defines regional boundaries for current confinement. This multi-functionality eliminates the need for separate shielding structures
Solution Approach 2:
The existing edge seal ring structure serves dual purposes: maintaining die integrity and containing electromagnetic interference. By strategically placing conductive connectors, the seal ring itself becomes part of the shielding mechanism, eliminating the need for additional dedicated shielding components
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
Enhances isolation between coils by redirecting induced currents, reducing electromagnetic interference, and maintaining the benefits of reduced die size and edge sealing without additional costs or complexity.
Implementation Method 1
a first coil; a second coil... the second coil is located outside the first-die region
Implementation Method 2
an electrically conductive loop that defines a first-die region within the loop, wherein the first coil is in the first-die region and the second coil is located outside the first-die region... the electrically conductive loop provides a current path that can increase the isolation between the first coil and the second coil
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
An electronic circuit, the electronic circuit comprising a first die. The first die comprises a first coil; a second coil; and an electrically conductive loop that defines a first-die region within the loop, wherein the first coil is in the first-die region and the second coil is located outside the first-die region.