Multi-Chip Module Proximity Communication Alignment
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Solution Overview
Problem
Current inter-chip communication technologies face challenges due to the dense packing of signal lines on semiconductor chips, leading to bottlenecks as integration densities increase, and existing alignment methods for proximity communication are complex and costly, especially when trying to achieve precise alignment for efficient capacitive coupling.
Innovation Solution
A multi-chip module (MCM) design that includes a base plate, alignment plate, interposer plate, and bridge chips with pyramidal-shaped features and micro-spheres for mechanical positioning and alignment, facilitating proximity communication through capacitive or optical coupling while allowing for wafer-scale assembly and reduced misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines are densely packed on semiconductor chips to increase integration density, then communication speed and system performance are improved, but the ability to route signal lines across printed circuit boards to other chips deteriorates, creating a communication bottleneck
Solution Approach 1:
The patent introduces an intermediary structure (the alignment feature with well and protrusion) that mediates between the densely packed signal lines on chips and the external communication needs. This intermediary enables direct chip-to-chip proximity communication without requiring signal lines to extend outside the chip, thus resolving the contradiction between high integration density and external routing capability
Solution Approach 2:
The patent transitions from two-dimensional planar signal line routing on printed circuit boards to three-dimensional vertical stacking with direct chip-to-chip coupling. By moving to another dimension (vertical proximity coupling), the system achieves high-speed communication without the routing constraints of planar board layouts
2Manufacturing precision
If mechanical mounting structures with etch pits and micro-spheres are used to align semiconductor dies, then alignment precision is improved, but manufacturing complexity and production cost increase
Solution Approach 1:
The alignment function is segmented into two distinct components: a well formed in the first semiconductor die and a protrusion formed on the second semiconductor die. This segmentation allows each component to be fabricated using standard photolithographic processes already present in chip manufacturing, eliminating the need for complex post-fabrication alignment structures like etch pits and micro-spheres
Solution Approach 2:
The alignment features (well and protrusion) are self-aligning by design - the protrusion on one die naturally fits into the well on the other die during bonding, providing automatic alignment without requiring external alignment tools or complex mounting structures. The structures serve their own alignment function through their geometric complementarity
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
The MCM design enables efficient proximity communication with reduced misalignment, lower production costs, and improved reliability against thermal stress and mechanical shocks, while simplifying the assembly process and reducing the need for precise manufacturing tolerances.
Implementation Method 1
adjacent semiconductor dies may be capacitively coupled to one another, and data signals may be transmitted from one chip to an adjacent chip via proximity communication
Data Source
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AI summary
Embodiments of a multi-chip module (MCM) are described. This MCM includes a first semiconductor die and a second semiconductor die, where a given semiconductor die, which can be the first semiconductor die or the second semiconductor die, includes proximity connectors proximate to a surface of the given semiconductor die. The given semiconductor die is configured to communicate signals with the other semiconductor die via proximity communication through one or more of the proximity connectors. Furthermore, the MCM includes an alignment plate and a top plate coupled to the alignment plate. This alignment plate includes a first negative feature configured to accommodate the first semiconductor die and a second negative feature configured to accommodate the second semiconductor die, and the top plate includes a positive feature. Note that the positive feature is coupled to the first semiconductor die, and the positive feature facilitates mechanical positioning of the first semiconductor die.