MEMS Isolation via Elastomeric Strain-Absorbing Layers
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Solution Overview
Problem
Microelectromechanical Systems (MEMS) devices with nanometer-sized sensing gaps are highly susceptible to external and internal stimuli, leading to increased noise and performance degradation due to the larger fraction of gap fluctuations caused by stresses, vibrations, and thermal transients, which existing technologies fail to adequately address.
Innovation Solution
A compliant isolation mechanism using elastomeric-strain-absorbing-material layers with varying elastic moduli is applied around the MEMS transducer to mechanically, thermally, and vibrationally isolate it from the substrate while maintaining electrical continuity, effectively reducing mechanical coupling and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nanometer-sized sensing gaps are used in MEMS devices, then measurement precision is improved, but susceptibility to external and internal stimuli increases
Solution Approach 1:
The patent introduces an isolation mechanism as an intermediary element between the MEMS transducer and the external environment. This mechanism includes isolation structures such as isolation layers and isolation cavities that mediate the interaction between the transducer and external stimuli, blocking harmful mechanical coupling while allowing the transducer to maintain its high-precision nanometer-sized sensing gaps for accurate measurement
2Object-affected harmful factors
If compliant adhesives and flexible substrates are used to reduce susceptibility, then isolation from stimuli is improved, but device complexity increases
Solution Approach 1:
The patent changes the physical parameters of the packaging structure by introducing isolation layers with specific mechanical properties (such as low stiffness or high compliance) and designing isolation cavities with optimized dimensions. These parameter changes enable the packaging to provide effective isolation from external stimuli without requiring complex multi-component structures, thereby reducing device complexity while maintaining isolation performance
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 significantly increases isolation from both external and internal stimuli, enhancing signal fidelity and reducing noise, thereby improving the signal-to-noise ratio and overall performance of MEMS devices like gyroscopes and accelerometers.
Implementation Method 1
a compliant isolation mechanism using elastomeric-strain-absorbing-material layers with varying elastic moduli
Implementation Method 2
mechanically, thermally, and vibrationally isolate it from the substrate
Implementation Method 3
mechanically, thermally, and vibrationally isolate it from the substrate
Data Source
AI summary
An isolation mechanism and technique for packaging a MEMS transducer, such as a bulk acoustic wave gyroscope or accelerometer, which allows rotational information to be sensed by the transducer while providing the necessary isolation from externally applied (or internally induced) stress, strain, vibration, shock and thermal transients. The isolation mechanism is constructed of interposing materials that may be implemented with elastomeric-strain-absorbing-materials (ESAM) layers having different elastic moduli, with the most compliant ESAM layer disposed closest to the MEMS transduce. In another embodiment, one or more ESAM layers may have air pockets dispersed therein. The isolation mechanism enables mechanical, thermal and vibrational isolation of the MEMS transducer from the package substrate, while still permitting electrical continuity between the MEMS device and the external environment.