MEMS Sensor Flip Chip Integration via TSV
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Solution Overview
Problem
Conventional MEMS sensors integrated with other components have larger package form factors due to wirebonded connections or side-by-side integration, necessitating a solution to reduce size and height while maintaining high-performance interconnects.
Innovation Solution
The integration of MEMS sensors with flip chip components using Through-Silicon Vias (TSVs) and redistribution layers (RDL) to establish electrical connections, replacing traditional wirebond/substrate routing and enabling a reduced form factor package size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If wirebonded connections or side by side integration are used, then electrical connections can be established, but package form factor (size and height) increases
Solution Approach 1:
The patent transitions from planar wirebond connections to three-dimensional vertical interconnections using TSVs. The TSV technology enables electrical connections to pass through the substrate thickness direction, transforming the interconnection architecture from two-dimensional surface routing to three-dimensional volumetric routing. This dimensional change allows components to be stacked vertically rather than arranged horizontally, directly reducing package footprint while maintaining connection functionality.
Solution Approach 2:
The patent implements nested integration where flip-chip components are positioned on top of the MEMS sensor substrate, and TSVs penetrate through multiple layers to establish connections. The redistribution layers are nested between the MEMS structure and the flip-chip components, creating a compact stacked architecture. This nesting approach allows multiple functional layers to occupy the same lateral footprint, reducing overall package size while maintaining all necessary electrical connections.
2Volume of moving object
If TSV and flip chip integration is used, then package size is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent employs preliminary action by pre-forming TSVs and redistribution layers on the MEMS substrate before attaching the flip-chip components. The TSVs are etched, filled, and planarized in advance, creating a prepared substrate with built-in interconnection structures. This preliminary preparation simplifies the subsequent flip-chip attachment process, as the electrical connections are already in place and only require alignment and bonding, rather than requiring complex post-attachment routing.
Solution Approach 2:
The patent introduces redistribution layers as intermediary structures between the TSVs and the flip-chip components. These redistribution layers serve as buffer and routing planes that simplify the connection architecture by redistributing signals from the vertical TSV connections to the appropriate pad locations on the flip-chip. This intermediary layer decouples the TSV formation process from the flip-chip attachment process, allowing each to be optimized independently and simplifying overall manufacturing.
Data Source
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AI summary
A method and system for providing a MEMS sensor integrated with a flip chip are disclosed. In a first aspect, the system comprises a MEMS sensor, at least one flip chip coupled to the MEMS sensor, and at least one through-silicon via (TSV) that electrically connects the at least one flip chip to the MEMS sensor. In a second aspect, the system comprises a MEMS sensor that includes a CMOS coupled to a MEMS structure, wherein the CMOS comprises a substrate coupled to an interconnect in contact with the MEMS structure. The system further comprises a plurality of flip chips coupled to the substrate, a plurality of TSV that electrically connect the plurality of flip chips to the interconnect, and a plurality of layers on the substrate to provide electrical connections between the plurality of flip chips and from the plurality of flip chips to at least one external component.