Periphery Structure Guard Ring Crack Stop
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Solution Overview
Problem
Integrated devices are prone to mechanical stress during coupling, leading to potential breakage and failure, necessitating a reliable solution for mechanical and electrical protection.
Innovation Solution
A periphery structure configured as both an electrical guard ring and a mechanical crack stop, comprising multiple layers of protection interconnects that surround a design keep out region and circuit area, providing isolation from external signals and preventing crack propagation, while optimizing device size and space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the integrated device is coupled to the substrate, then electrical connection is established, but mechanical stress causes breakage and failure
Solution Approach 1:
The patent implements a periphery structure with multiple interconnect layers that acts as a protective barrier before mechanical stress can reach critical components. This structure absorbs and distributes mechanical stress during coupling, preventing crack propagation into the circuit region and protecting the device from mechanical failure while maintaining electrical connectivity
2Reliability
If protection structures are added to prevent mechanical stress, then reliability improves, but device complexity increases
Solution Approach 1:
The periphery structure serves multiple functions simultaneously: it acts as an electrical guard ring to isolate external signals, a mechanical crack stop to prevent stress propagation, and a protective barrier during coupling. By consolidating these protection functions into a single integrated structure rather than separate components, the patent reduces overall device complexity while maintaining comprehensive protection
Solution Approach 2:
The patent combines the electrical guard ring and mechanical crack stop functions into a unified periphery structure formed through integrated interconnect layers. This merging of functions eliminates the need for separate protection structures, reducing fabrication steps and structural complexity while providing both electrical isolation and mechanical protection
3Reliability
If periphery structure is added for protection, then reliability improves, but space utilization decreases
Solution Approach 1:
The periphery structure is divided into multiple interconnect layers positioned at different depths within the device structure. This segmentation allows the protection function to be distributed throughout the device volume rather than occupying additional surface area, enabling efficient use of the three-dimensional space and maintaining compact device footprint
Data Source
AI summary
An integrated device that includes a substrate, a circuit region located over the substrate, a design keep out region located over the substrate, and a periphery structure located over the substrate. The design keep out region laterally surrounds the circuit region. The periphery structure includes a first plurality of interconnects that laterally surrounds the design keep out region. The periphery structure is configured to operate as an electrical seal ring and a mechanical crack stop.