3D Interconnect Cube Packaging With Planarized Die Edges
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Solution Overview
Problem
Current Multi-Chip Module (MCM) packaging architectures are limited in scaling to higher bandwidth and signal speeds due to bandwidth reduction, signal delay, and signal distortion, primarily because of the parallel orientation and interconnection configuration of IC dies, which restricts the number of high-power compute IC dies that can be placed in a package.
Innovation Solution
The proposed solution involves coupling IC dies with planarized edges and orthogonal surfaces, using oxide-oxide and metal-metal bonds, and a metallization stack with conductive traces and vias, allowing for increased interconnect density and improved thermal management, enabling more efficient heat dissipation and higher density packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IC dies are arranged in parallel orientation with conventional interconnection configuration, then ease of manufacture is maintained, but bandwidth and signal speed are limited
Solution Approach 1:
The patent transitions from conventional 2D parallel arrangement to a 3D stacked architecture where IC dies are vertically positioned and interconnected through through-silicon vias (TSVs). This dimensional change enables significantly higher interconnect density and bandwidth while maintaining signal integrity through direct vertical pathways.
Solution Approach 2:
The patent implements nested interconnection structures where multiple interconnect layers are stacked vertically within the package. Each die stack contains multiple TSV layers and interconnect levels, creating a nested configuration that maximizes bandwidth within a compact footprint.
2Productivity
If more high-power compute IC dies are placed in a package, then productivity increases, but thermal management becomes more difficult
Solution Approach 1:
The patent introduces intermediate heat spreader layers and thermal interface materials between stacked IC dies. These intermediary thermal management components facilitate efficient heat transfer from high-power compute dies to cooling structures, enabling higher compute density without thermal runaway.
Solution Approach 2:
The patent implements localized thermal management solutions with heat sinks and cooling channels positioned directly beneath high-power compute dies. This localized approach optimizes heat dissipation at the hottest spots while maintaining overall package thermal balance.
3Speed
If conventional parallel IC die arrangement is used, then device complexity is low, but signal delay increases
Solution Approach 1:
The patent employs vertical TSV interconnections that provide direct through-silicon pathways, dramatically reducing signal path length compared to lateral routing in parallel arrangements. This 3D vertical interconnect architecture enables faster signal propagation while managing the complexity through standardized via formation processes.
Data Source
AI summary
Embodiments of an integrated circuit (IC) die comprise: a metallization stack including a dielectric material, a plurality of layers of conductive traces in the dielectric material and conductive vias through the dielectric material; and a substrate attached to the metallization stack along a planar interface. The metallization stack comprises bond-pads on a first surface, a second surface, a third surface, a fourth surface, and a fifth surface. The first surface is parallel to the planar interface between the metallization stack and the substrate, the second surface is parallel to the third surface and orthogonal to the first surface, and the fourth surface is parallel to the fifth surface and orthogonal to the first surface and the second surface.