Inductive Coil Loop Layout for Edge Seal Ring EMI 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, particularly in smaller die sizes where coils are closer to the edge seal ring, affecting data transmission reliability.
Innovation Solution
Implementing electrically conductive connectors that split the area defined by the edge seal ring into separate regions, directing induced currents away from sensitive coils, thereby reducing channel-to-channel interference without altering die spacing or edge seal integrity.
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 due to unwanted inductive coupling
Solution Approach 1:
A conductive connector is introduced as an intermediary element between the coils and the edge seal ring. This connector acts as a mediator that provides a controlled current path, preventing unwanted inductive coupling between the coils and the edge seal ring while allowing the coils to remain close to the ring for compact die area.
Solution Approach 2:
The edge seal ring, which normally acts as a source of electromagnetic interference through unwanted inductive coupling, is converted into a beneficial element by providing a controlled current path through the conductive connector. The ring's inductive coupling effect is harnessed to create a defined current path that actually reduces interference rather than causing it.
2Area of stationary object
If die size is reduced to maintain compactness, then manufacturing cost is reduced, but channel-to-channel interference increases
Solution Approach 1:
The conductive connector segments the current path into distinct regions, creating separate current loops for different channels. This segmentation prevents cross-channel interference by ensuring that currents from one channel do not couple into adjacent channels, even when channels are closely spaced on a compact die.
3Object-affected harmful factors
If additional shielding structures are added to reduce interference, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The conductive connector performs multiple functions simultaneously: it provides electrical connection, defines current paths, reduces electromagnetic interference, and enables compact coil placement. This multi-functionality eliminates the need for separate shielding structures, maintaining device simplicity while achieving interference reduction.
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, minimizing electromagnetic interference, and maintaining die size benefits without additional costs or complexity.
Implementation Method 1
unwanted inductive coupling between coils and edge seal rings
Implementation Method 2
affecting data transmission reliability
Implementation Method 3
inductively coupled to the first-die transmitter coil
Implementation Method 4
electrically insulating regions between: the first-die transmitter coil and the second-die receiver coil
Data Source
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.