MEMS Pressure Sensor and Microphone Integration via Shared Interconnects
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Solution Overview
Problem
Integrating MEMS pressure sensor, microphone, and motion sensor devices into the same integrated circuit manufacturing process poses challenges due to unique requirements and complexities in electrically interconnecting these devices.
Innovation Solution
The process involves manufacturing MEMS devices using a common IC process, where a MEMS wafer with a substrate and dielectric layers is patterned to form polysilicon vias and bumps for electrical routing and mechanical structures, and bonding with a carrier wafer to create sealed cavities for pressure sensing and ambient exposure, allowing for the integration of pressure sensors, microphones, and motion sensors within the same manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MEMS pressure sensor, microphone, and motion sensor devices are integrated into the same integrated circuit manufacturing process, then manufacturing efficiency and device functionality are improved, but the complexity of electrically interconnecting these devices increases
Solution Approach 1:
The patent combines multiple MEMS device types (pressure sensors, microphones, motion sensors) into a single integrated device that uses shared electrical interconnection structures. By merging the interconnection requirements of different sensor types, the patent reduces overall complexity while maintaining manufacturing efficiency benefits of integration.
Solution Approach 2:
The patent creates universal electrical interconnection structures that can serve multiple device types simultaneously. The same interconnection architecture is designed to handle signaling for pressure sensors, microphones, and motion sensors, eliminating the need for separate interconnection paths for each device type.
2Adaptability or versatility
If multiple MEMS device types are integrated into the same manufacturing process, then device functionality is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent segments the manufacturing process into distinct modules, each optimized for specific MEMS device types, while maintaining a common overall process flow. This allows different sensor types to be manufactured using specialized techniques within the same integrated process, preserving functionality while managing complexity through structured organization.
Solution Approach 2:
The patent integrates multiple device types in a three-dimensional stacked architecture rather than planar arrangement. Pressure sensors, microphones, and motion sensors are positioned at different vertical levels with shared interconnection layers, allowing functional integration without proportionally increasing process complexity.
3Productivity
If MEMS devices are miniaturized and integrated, then manufacturing efficiency is improved, but the precision of electrical interconnections required increases
Solution Approach 1:
The patent implements nested interconnection structures where lower-level connection paths are embedded within higher-level routing layers. This nested architecture allows precise local interconnections for miniaturized components while using broader routing paths at higher levels, maintaining both precision and manufacturing efficiency.
Data Source
AI summary
A micro-electromechanical systems (MEMS) device includes a MEMS substrate having a first opening, a second opening, and a membrane layer comprising a first membrane disposed over the first opening and a second membrane disposed over the second opening. The MEMS device also includes a carrier substrate bonded to a first side of the MEMS substrate, the carrier substrate having a first cavity exposing the first membrane and a second cavity exposing the second membrane, and a cap substrate bonded to a second side of the MEMS substrate. The cap substrate has a third cavity connected to the first opening and a fourth cavity connected to the second opening. The first membrane, the first cavity, and the third cavity are part of a pressure sensor. The fourth cavity extends completely through the cap substrate. The second membrane, the second cavity, and the fourth cavity are part of a microphone.