TSV Cluster Guard Ring Layout for Reduced Via Pitch
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Solution Overview
Problem
The challenge in semiconductor manufacturing is to reduce the pitch between through substrate vias (TSVs) to enhance integration density, reduce area consumption, and improve performance and power efficiency in semiconductor devices.
Innovation Solution
Implementing a TSV cluster with merged guard rings and dummy interconnect structures between adjacent TSVs to reduce pitch, allowing for a more compact design and improved electrical isolation, stress relief, and uniform pattern density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pitch between TSVs is reduced to enhance integration density, then area consumption is reduced, but manufacturing precision and electrical isolation become more difficult to maintain
Solution Approach 1:
Multiple separate guard rings surrounding individual TSVs are merged into a single continuous guard ring structure that surrounds multiple TSVs. This merging reduces the total area occupied by guard rings while maintaining electrical isolation between TSVs, thereby reducing pitch and area consumption without compromising manufacturing precision
Solution Approach 2:
The merged guard ring structure serves multiple functions simultaneously: it provides electrical isolation between adjacent TSVs, maintains stress relief, enables uniform pattern density for manufacturing, and reduces overall area consumption. This multi-functionality allows the structure to maintain precision while reducing pitch
2Area of stationary object
If the pitch between TSVs is reduced to improve integration density, then device footprint is reduced, but electrical isolation between TSVs becomes more challenging
Solution Approach 1:
The guard rings are merged into a continuous structure that extends between adjacent TSVs, providing uninterrupted electrical isolation paths. This merged structure maintains reliable electrical isolation even when pitch is reduced, as the continuous guard ring prevents signal leakage between closely spaced TSVs
Solution Approach 2:
The merged guard ring acts as an intermediary structure between adjacent TSVs, providing a continuous isolating barrier that maintains electrical isolation reliability. The guard ring material serves as a mediating element that prevents direct electrical interaction between TSVs while allowing the pitch to be reduced
3Manufacturing precision
If merged guard rings are implemented to reduce area, then uniform pattern density is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple discrete guard ring structures are merged into a single continuous pattern, which simplifies the overall manufacturing process by reducing the number of separate patterning steps required. The merged structure creates uniform pattern density that is easier to manufacture with standard lithography processes
Data Source
AI summary
An embodiment includes a device, the device including a first die including a first surface and a second surface opposite the first surface. The first die includes a plurality of through substrate vias (TSVs) exposed from the second surface of the first die. The device also includes a guard ring surrounding the plurality of TSVs. The device also includes a dummy metallization pattern surrounding the guard ring. The device also includes an active metallization pattern connected to active devices in the first die.