Capacitive Pressure Sensor Wafer Bonding Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current MEMS devices face challenges in integrating multiple transducers, such as pressure sensors and inertial sensors, into a single package while optimizing spatial layout, surface area usage, and cost, especially in small devices like smartphones and wearables.
Innovation Solution
A MEMS device is designed with a capacitive pressure sensor that includes a differential pressure sensor structure formed by bonding two semiconductor wafers, utilizing epitaxially grown N-type doped polysilicon and silicon oxide layers to minimize space and reduce manufacturing costs, allowing for easy integration and adaptation to various layouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transducers are integrated in a single package, then space usage is optimized and device size is reduced, but manufacturing complexity and design costs increase
Solution Approach 1:
The patent combines multiple transducer types (pressure sensors, inertial sensors) into a single integrated device package, merging previously separate components into one unified structure that reduces total surface area and enables compact device integration
Solution Approach 2:
The integrated device package is designed to perform multiple functions simultaneously, housing both pressure sensing and inertial sensing capabilities within a single package that can be universally applied in various electronic devices requiring multiple sensor functions
2Manufacturing precision
If dedicated integrated-circuit boards are used for each transducer, then each sensor can be optimized independently, but space consumption increases significantly
Solution Approach 1:
The patent merges multiple dedicated sensor packages into a single integrated device, combining what would have been separate optimized components into one unified structure that maintains individual sensor optimization while eliminating the need for separate circuit boards
3Adaptability or versatility
If different types of sensors are integrated in small devices, then device functionality is enhanced, but the total surface area required becomes too great
Solution Approach 1:
The patent combines multiple sensor types into a single compact integrated device package, merging pressure sensors, inertial sensors, and other transducers into one unified structure that provides enhanced functionality while minimizing the total surface area required
Solution Approach 2:
The patent transitions from two-dimensional layout of separate sensors on different circuit boards to a three-dimensional integrated structure where multiple sensor types are stacked or arranged vertically within a single package, effectively utilizing vertical space to reduce footprint area
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 solution enables efficient integration of multiple sensors in a compact form, reducing design costs and optimizing space usage, while maintaining sensitivity and accuracy in pressure detection, suitable for small devices like smartphones and wearables.
Implementation Method 1
bonded together to form a monolithic structure
Implementation Method 2
epitaxially grown N-type doped polysilicon and silicon oxide layers
Data Source
AI summary
MEMS device, in which a body made of semiconductor material contains a chamber, and a first column inside the chamber. A cap of semiconductor material is attached to the body and forms a first membrane, a first cavity and a first channel. The chamber is closed on the side of the cap. The first membrane, the first cavity, the first channel and the first column form a capacitive pressure sensor structure. The first membrane is arranged between the first cavity and the second face, the first channel extends between the first cavity and the first face or between the first cavity and the second face and the first column extends towards the first membrane and forms, along with the first membrane, plates of a first capacitor element.