Z-Interconnect Packaging for High-Speed IC Thermal Management
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Solution Overview
Problem
Current integrated circuit packaging technologies face challenges in accommodating high-speed devices exceeding one TeraHertz, with limitations in cooling, reliability, and cost-effectiveness, while also struggling with increasing complexity and potential errors in manufacturing.
Innovation Solution
The method involves using a z-interconnect system with traces cantilevered over integrated circuits, mounted on a substrate and encapsulated, which reduces the need for additional components like laminated interposers or buildup layers, thereby simplifying the manufacturing process and enhancing connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional packaging technologies are used for high-speed devices exceeding one TeraHertz, then device functionality is maintained, but cooling efficiency deteriorates and reliability decreases
Solution Approach 1:
The patent introduces Z-interconnects that extend vertically through the packaging structure, transitioning from traditional planar (2D) interconnect layouts to three-dimensional (3D) configurations. This dimensional change enables direct thermal pathways from high-speed devices to heat sinks and improves signal integrity while reducing EMI radiation.
Solution Approach 2:
The Z-interconnect structure serves multiple functions simultaneously: it provides electrical interconnection between layers, establishes thermal conduction pathways for heat dissipation, and acts as a structural support element. This multi-functionality resolves the contradiction by integrating cooling and reliability functions into a single architectural feature.
2Reliability
If additional components like laminated interposers or buildup layers are added to enhance connectivity, then device performance improves, but manufacturing complexity increases and production costs rise
Solution Approach 1:
The patent merges the functions of separate components (interposers, buildup layers, and interconnect structures) into an integrated Z-interconnect architecture. This consolidation eliminates the need for multiple discrete components while maintaining or enhancing connectivity robustness, thereby reducing manufacturing complexity and assembly steps.
Solution Approach 2:
The invention extracts and eliminates unnecessary intermediate components (laminated interposers and excessive buildup layers) from the packaging structure, retaining only the essential Z-interconnect elements that provide both mechanical support and electrical connectivity. This simplification reduces manufacturing complexity without compromising connectivity.
3Temperature
If more components are added to address cooling and connectivity needs, then device functionality improves, but production time increases and manufacturing costs rise
Solution Approach 1:
The Z-interconnect structure combines thermal management and electrical interconnection functions into a single integrated component, eliminating the need for separate heat sinks, thermal vias, and interconnect layers. This merger reduces the total component count and simplifies assembly processes, thereby improving production efficiency while maintaining effective thermal management.
4Ease of manufacture
If traditional interconnect assemblies are used, then manufacturing processes are well-established, but EMI radiation increases and thermal loads are not adequately managed
Solution Approach 1:
By transitioning from planar interconnect traces to vertical Z-interconnects, the patent reduces the surface area of current-carrying traces exposed to the environment, thereby minimizing EMI radiation. The three-dimensional configuration confines electromagnetic fields more effectively while maintaining manufacturing feasibility through adapted fabrication processes.
Data Source
AI summary
A method of manufacture of an integrated circuit packaging system includes: providing a carrier; mounting an integrated circuit on the carrier; mounting a z-interconnect on the carrier, the z-interconnect for supporting a trace cantilevered over the integrated circuit; encapsulating the integrated circuit with an encapsulation; removing the carrier; and depositing a substrate below the integrated circuit.