MEMS Device Flip Chip Integration
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Solution Overview
Problem
Conventional MEMS devices face challenges in miniaturization and manufacturing efficiency due to the need for bond wires connecting MEMS chips and ASICs, which increases complexity and costs.
Innovation Solution
The solution involves a MEMS device design where a first chip with an integrated circuit is mechanically and electrically connected to a MEMS chip using a smaller mounting surface, allowing for reduced space requirements and simplified manufacturing by using flip chip technologies like wafer bonding, and optionally embedding the ASIC within the MEMS chip or connecting via conductor lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bond wires are used to connect MEMS chip and ASIC, then electrical connection is achieved, but device complexity and manufacturing effort increase
Solution Approach 1:
The patent combines the MEMS chip and ASIC into a single integrated device structure where the ASIC is directly mounted on the MEMS chip substrate. This merging eliminates the need for separate bond wire connections and external housing, reducing manufacturing complexity while maintaining reliable electrical connections through direct integration.
Solution Approach 2:
The mounting surface of the MEMS chip serves multiple functions: it provides mechanical support for the ASIC, establishes electrical connections through contact pads, and eliminates the need for separate housing structures. This multi-functionality reduces the number of components and simplifies the overall device architecture.
2Strength
If separate housing is used to enclose MEMS chip and ASIC, then mechanical protection is provided, but device size increases
Solution Approach 1:
The patent merges the housing function into the existing chip substrates and mounting structures. The MEMS chip substrate and ASIC packaging serve dual purposes as both structural components and protective enclosures, eliminating the need for additional external housing and reducing overall device volume.
Solution Approach 2:
The ASIC is nested directly on the MEMS chip substrate, with the mounting surface and contact pads providing both structural support and protection. This nested arrangement allows the protective function to be integrated within the existing device layers rather than requiring external housing.
3Volume of moving object
If mounting surface of first chip is made smaller, then device miniaturization is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by concentrating the contact pads and mounting features in specific optimized locations on the MEMS chip substrate. The mounting surface geometry and contact pad distribution are locally optimized to facilitate precise alignment and bonding, enabling miniaturization without compromising manufacturing precision.
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 further miniaturization of MEMS devices, reduces manufacturing costs, and eliminates the need for additional housing, allowing direct connection to external devices while maintaining effective electrical and mechanical attachment.
Implementation Method 1
The ASIC is mechanically attached and electrically connected to the second set of contact pads by wafer bonding the mounting surface facing the main surface
Data Source
AI summary
A MEMS device includes a first chip and a MEMS chip. The first chip has a mounting surface and includes at least an integrated circuit. The MEMS chip has a main surface on which a first set of contact pads for contacting the MEMS device and a second set of contact pads for contacting the first chip are arranged. The first chip is mechanically attached and electrically connected to the second set of contact pads via the mounting surface facing the main surface. The mounting surface of the first chip is at least 25% smaller than the main surface of the MEMS chip.