Stiffener-Cavity IC Package Layout for Warpage Control
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Solution Overview
Problem
Existing integrated circuit (IC) packages face challenges in achieving higher processing capability and memory capacity while maintaining a reduced size, as larger semiconductor dies and increased package size lead to warpage and manufacturing issues, and current solutions like die thinning and form-factor miniaturization have not kept pace with demands.
Innovation Solution
Incorporating semiconductor dies within cavities in a stiffener, which is adjacent to the package substrate, allowing for additional memory and processing capacity without increasing the package size, and utilizing a thermally conductive material to enhance thermal dissipation and reduce warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger semiconductor dies are used to increase processing capability and memory capacity, then the computing performance is improved, but the package size increases and warpage occurs
Solution Approach 1:
The patent embeds semiconductor dies within cavities formed in the stiffener structure. The stiffener serves dual purposes: providing mechanical support to prevent warpage and containing the dies within its cavities. This nesting approach allows high-density integration without increasing the overall package footprint, as the dies are housed within the existing stiffener volume rather than requiring additional external space.
Solution Approach 2:
The patent transitions from a traditional planar arrangement where dies are mounted on the package substrate surface to a three-dimensional configuration where dies are embedded within the stiffener's cavities. This vertical integration into the stiffener thickness dimension enables higher density without increasing the package's lateral dimensions, effectively utilizing the Z-axis for component placement.
2Quantity of substance
If larger semiconductor dies are used to increase memory capacity, then the storage capability is improved, but warpage and manufacturing issues occur
Solution Approach 1:
The stiffener's cavities provide enclosed spaces that house the semiconductor dies, allowing the stiffener to function as both a structural support element and a mounting platform. This integration ensures that large-capacity dies are properly supported and constrained, preventing warpage while achieving high memory capacity within the same package footprint.
Solution Approach 2:
The patent employs a composite structure combining the stiffener material (providing mechanical strength and warpage resistance) with the semiconductor dies (providing high memory capacity). The stiffener acts as a rigid support framework that compensates for the thermal and mechanical stresses generated by high-capacity dies, maintaining manufacturing precision despite increased die size.
3Area of stationary object
If die thinning is applied to reduce package size, then the footprint is reduced, but manufacturing complexity increases
Solution Approach 1:
Instead of thinning the dies to reduce package size, the patent inverts the approach by embedding the dies within the stiffener's cavities. This maintains the dies at their original thickness while achieving compact packaging through vertical integration, thereby avoiding the manufacturing complexity and reliability issues associated with die thinning processes.
4Length of stationary object
If form-factor miniaturization is applied to reduce package size, then the dimensions are reduced, but it has not kept pace with increasing demands
Solution Approach 1:
The patent achieves miniaturization by utilizing the vertical dimension within the stiffener structure. Multiple dies are stacked or arranged within the cavities of the stiffener, enabling high processing capability in a compact footprint. This three-dimensional integration allows the package to meet increasing performance demands without proportionally increasing its lateral dimensions.
Solution Approach 2:
The stiffener's cavities are designed to accommodate multiple semiconductor dies in a nested configuration. This allows high-density integration of processing elements within the stiffener's volume, achieving superior processing capability in a reduced form factor compared to traditional planar arrangements where dies would require additional external space.
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 enables improved product assembly yield, reduced warpage, and enhanced thermal dissipation, while maintaining a compact package size, thus addressing the challenges of miniaturization and warpage in high-performance computing applications.
Implementation Method 1
utilizing a thermally conductive material to enhance thermal dissipation and reduce warpage
Data Source
AI summary
Integrated circuit packages with stiffeners containing semiconductor dies and associated methods are disclosed. An example apparatus includes: a base die coupled to a package substrate; a stiffener adjacent the base die, the stiffener including a cavity; and a semiconductor die different from the base die. The semiconductor die is in the cavity in the stiffener. The example apparatus also includes a bridge to electrically couple the semiconductor die to the base die.