Integrated MEMS Pressure and Inertial Sensor Fabrication
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Solution Overview
Problem
The integration of MEMS pressure sensors and inertial sensors into a single device is challenging due to differences in manufacturing and packaging methods, resulting in complex processing, large package sizes, and high costs.
Innovation Solution
A method for fabricating an integrated MEMS device by forming a MEMS pressure sensor on one side of a semiconductor substrate and a MEMS inertial sensor on the opposite side, sharing a vacuum cavity to reduce chip size and using the same capacitive sensing method for data readout and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If MEMS pressure sensors and MEMS inertial sensors are designed and manufactured separately and then packaged together, then each sensor can be optimized independently, but the package size becomes large and the manufacturing complexity increases
Solution Approach 1:
The patent combines MEMS pressure sensors and MEMS inertial sensors into a single integrated device manufactured on one semiconductor substrate. This merging eliminates the need for separate packaging processes, reduces overall device complexity, and maintains the ability to independently optimize each sensor type through separate processing steps on the same substrate.
Solution Approach 2:
The patent utilizes vertical stacking architecture where pressure sensors and inertial sensors are positioned on different layers or sides of the semiconductor substrate. This three-dimensional arrangement allows both sensor types to coexist without lateral interference, reducing the horizontal footprint while maintaining independent optimization capabilities for each sensor type.
2Manufacturing precision
If MEMS pressure sensors and MEMS inertial sensors are designed and manufactured separately and then packaged together, then each sensor can be optimized independently, but the manufacturing cost increases
Solution Approach 1:
The patent integrates both sensor types in a single manufacturing process flow on one semiconductor substrate, eliminating multiple packaging operations, alignment steps, and assembly procedures. This consolidation significantly reduces manufacturing costs while preserving the ability to independently design and optimize each sensor type through dedicated processing steps.
3Area of stationary object
If MEMS pressure sensors and MEMS inertial sensors are integrated on the same substrate, then the device size is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the semiconductor substrate into distinct processing regions or layers, with separate processing sequences for pressure sensors and inertial sensors. This segmentation allows each sensor type to be manufactured using its optimized process steps while sharing common substrate infrastructure, reducing processing complexity compared to a fully integrated monolithic approach.
Solution Approach 2:
The patent employs vertical stacking where pressure sensors and inertial sensors occupy different vertical layers or opposite sides of the substrate. This three-dimensional integration minimizes lateral space requirements, reducing the device footprint while keeping processing steps organized by layer, thereby managing complexity through vertical rather than horizontal integration.
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 the creation of a compact, cost-effective integrated device capable of measuring multiple parameters such as acceleration, angular velocity, and pressure, with a reduced footprint and simplified processing, facilitating the integration of multiple sensors into a single chip.
Implementation Method 1
using the same capacitive sensing method for data readout and processing
Data Source
AI summary
Integrated MEMS devices for pressure sensing and inertial sensing, methods for fabricating such integrated devices, and methods for fabricating vertically integrated MEMS pressure sensor/inertial sensor devices are provided. In an example, a method for fabricating an integrated device for pressure and inertial sensing includes forming a MEMS pressure sensor on a first side of a semiconductor substrate. The method further includes forming a MEMS inertial sensor on a second side of the semiconductor substrate. The second side of the semiconductor substrate is opposite the first side of the semiconductor substrate.