Silicon MEMS Spring Interconnect for Repeated Chip Mating
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Solution Overview
Problem
Existing electrical connections in quantum computing, such as wire bonds and indium bumps, are permanent and prone to damage during repeated mating and demating, lacking the reliability and durability needed for frequent connections.
Innovation Solution
A microelectromechanical system (MEMS) device with a silicon substrate featuring a spring body interconnect, comprising two spring arms of constant curvature, allowing rotational movement and enabling multiple connections with controlled separation for reliable and durable chip connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonds or indium bumps are used for electrical connections, then electrical conductivity is achieved, but the connections are permanent and frail, easily damaged during de-mating operations
Solution Approach 1:
The patent applies the dynamics principle by transforming static permanent connections into dynamic reusable connections. The MEMS interconnect incorporates spring arms that can deflect and return to their original position, enabling the connection to be mated and demated multiple times while maintaining reliability. The spring mechanism provides mechanical compliance that accommodates alignment tolerances and absorbs stress during repeated connection cycles.
2Adaptability or versatility
If traditional permanent connections are used, then electrical connectivity is established, but the connections lack flexibility and are prone to damage during handling and de-mating
Solution Approach 1:
The patent employs the flexible shells and thin films principle through the use of spring arms with controlled deflection characteristics. The spring arms are designed with specific geometric parameters (length, width, thickness) that provide the necessary flexibility for mating operations while maintaining sufficient strength to prevent damage. The spring mechanism allows the interconnect to adapt to alignment variations and absorb mechanical stress without permanent deformation.
3Adaptability or versatility
If spring arms with complex curvature are used to enable rotational movement, then connection versatility is improved, but manufacturing precision becomes more difficult to achieve
Solution Approach 1:
The patent applies the spheroidality (curvature) principle by designing spring arms with constant curvature profiles. The spring arms feature a uniform radius of curvature along their length, which simplifies the manufacturing process compared to complex variable curvature designs. This constant curvature geometry can be fabricated using standard MEMS processing techniques while still providing the necessary rotational movement capability and mechanical compliance for reliable connections.
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 MEMS device provides durable and reliable connections, tolerating the required forces and motion for repeated mating and demating cycles, with a small footprint and inherent rotational scrubbing movement, surpassing the limitations of traditional wire bonds and indium bumps.
Implementation Method 1
Each spring arm includes a first end distal from a center of the interconnect, a second end proximate the center of the interconnect, and a single turn of a constant curvature. Each spring arm is configured to move rotationally in a plane parallel to the top surface of the silicon substrate.
Data Source
AI summary
A microelectromechanical system (MEMS) device and method of fabrication are provided. The MEMS devices includes a silicon substrate. The silicon substrate includes a top surface. An interconnect is machined from the silicon substrate. The interconnect includes at a spring body that has least two spring arms. Each spring arm includes a first end distal from a center of the interconnect, a second end proximate the center of the interconnect, and a single turn of a constant curvature. Each spring arm is configured to move rotationally in a plane parallel to the top surface of the silicon substrate.