Thermal-Only Through Vias for Multi-Layer Semiconductor Stack Heat Dissipation
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Solution Overview
Problem
Multi-layer semiconductor stacks face challenges in data communication latency, thermal dissipation, and power distribution losses due to the complexity and size of integrated circuitry, which hinder performance and increase manufacturing costs.
Innovation Solution
The implementation of thermal-only through vias and strategic sequencing of semiconductor dies based on current density to enhance thermal conductivity and minimize power distribution losses, alongside a standardized inter-layer bus for efficient data communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple semiconductor chips are stacked to reduce communication latency, then data communication speed between layers is improved, but thermal density increases significantly
Solution Approach 1:
The patent segments the thermal management function by introducing dedicated thermal-only through vias separate from data-carrying and power-carrying through vias. This segmentation allows heat to be conducted independently through specific thermal pathways without interference from electrical signals, effectively managing thermal density in multi-layer stacks while maintaining high-speed data communication through separate vias.
Solution Approach 2:
The patent introduces a thermal intermediary substance (thermal compound or heat sink) between the semiconductor die and the heat dissipation structure. This intermediary enhances thermal transfer from the high-density stacked dies to the cooling system, addressing the thermal density issue while preserving the compact stacked architecture that enables fast data communication.
2Temperature
If through vias are added to improve thermal conductivity, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by having through vias serve multiple purposes: data-carrying vias transmit signals, power-carrying vias provide electrical power, and thermal-only vias conduct heat. This universal approach to through via utilization maximizes the functional density of the stacked structure, improving thermal conductivity while minimizing the need for additional separate thermal management components that would increase device complexity.
Solution Approach 2:
The patent merges thermal management with the existing via structure by integrating thermal-only through vias into the same inter-layer connection architecture used for data and power. This merging approach allows thermal conduction to be achieved without adding separate external cooling structures, thereby improving thermal conductivity while keeping the overall device complexity manageable through shared infrastructure.
3Temperature
If heat sinks are mounted to chip surfaces, then thermal dissipation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent transitions from two-dimensional surface-mounted heat sinks to three-dimensional through-via thermal pathways that extend vertically through multiple layers. This dimensional change allows heat to be conducted through the thickness of the stacked structure, improving thermal dissipation from internal heat sources without requiring complex surface-mounted heat sink assemblies, thereby simplifying manufacturing while enhancing thermal management.
Solution Approach 2:
The patent replaces the mechanical heat sink mounting system with an integrated thermal conduction system using through vias filled with thermally conductive material. This substitution eliminates the need for mechanical attachment of heat sinks to chip surfaces, reducing manufacturing complexity associated with alignment, bonding, and thermal interface material application, while still achieving effective thermal dissipation through the stacked structure.
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
This approach improves thermal conductivity and reduces power distribution losses in multi-layer semiconductor stacks, leading to enhanced performance and cost-effectiveness by optimizing heat dissipation and data communication within the stack.
Implementation Method 1
A third subset of the conductive through vias are configured as thermal-only through vias that are non-data-carrying and non-power-carrying and that conduct thermal energy generated by the circuit layers within the stack
Implementation Method 2
Conventionally, heat is dissipated from semiconductor chips through the use of heat sink arrangements that are mounted to the surfaces of chips to conduct heat away from the chips
Data Source
AI summary
A circuit arrangement and method in one aspect utilize thermal-only through vias, extending between the opposing faces of stacked semiconductor dies, to increase the thermal conductivity of a multi-layer semiconductor stack. The thermal vias are provided in addition to data-carrying through vias, which communicate data signals between circuit layers, and power-carrying through vias, which are coupled to a power distribution network for the circuit layers, such that the thermal conductivity is increased above that which may be provided by the data-carrying and power-carrying through vias in the stack. A circuit arrangement and method in another aspect organize the circuit layers in a multi-layer semiconductor stack based upon current density so as to reduce power distribution losses in the stack.