MEMS Gyroscope Driving Frequency Mismatch Regulation
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Solution Overview
Problem
MEMS gyroscopes face challenges in regulating the mismatch between driving and sensing frequencies, leading to issues with detection sensitivity, noise levels, and stability, particularly due to the high impact on occupied area and power consumption of existing solutions.
Innovation Solution
A MEMS gyroscope with a structure that adjusts the driving frequency using parallel-plate capacitive elements and a single tuning voltage applied to fixed tuning electrodes, allowing for efficient regulation of the frequency mismatch without the need for additional space or high power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing solutions for regulating frequency mismatch are implemented, then detection sensitivity and stability are improved, but occupied area and power consumption increase significantly
Solution Approach 1:
The patent combines the frequency tuning function with existing structural elements of the MEMS gyroscope. The tuning electrodes are integrated into the supporting structure, and the capacitive elements are formed using the same fabrication processes as the main gyroscope components, merging multiple functions into a unified structure that reduces overall device area.
Solution Approach 2:
The supporting structure serves multiple functions: it provides mechanical support for the mobile mass, houses the tuning electrodes for frequency regulation, and contains the capacitive elements for actuation. This multi-functionality eliminates the need for separate dedicated structures, thereby reducing the total occupied area.
2Reliability
If existing solutions for regulating frequency mismatch are implemented, then detection sensitivity and stability are improved, but power consumption increases significantly
Solution Approach 1:
The patent employs capacitive actuation to adjust the resonant frequency of the supporting structure by changing the electrostatic field parameters. By varying the voltage applied to the tuning electrodes, the frequency mismatch can be regulated without mechanical movement, thereby minimizing power consumption compared to mechanically actuated tuning mechanisms.
Solution Approach 2:
The invention replaces mechanical tuning mechanisms with an electrostatic field-based capacitive actuation system. This substitution eliminates the need for moving parts in the tuning mechanism, reducing friction, wear, and power consumption while improving reliability and detection sensitivity.
3Measurement precision
If frequency mismatch regulation is implemented, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent divides the supporting structure into distinct functional zones: regions with tuning electrodes for frequency regulation and regions with capacitive elements for actuation. This segmentation allows independent optimization of each function while maintaining overall structural simplicity and facilitating straightforward fabrication.
Solution Approach 2:
The invention introduces dynamically adjustable capacitive elements that can modify the electrostatic field in real-time to regulate frequency mismatch. This dynamic capability enables continuous optimization of detection sensitivity without requiring complex mechanical adjustments or multiple discrete components.
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 solution enables effective adjustment of the frequency mismatch, improving detection sensitivity and stability while reducing area occupation and power consumption, making it suitable for consumer and automotive applications.
Implementation Method 1
parallel-plate capacitive elements... A driving-frequency tuner electrically coupled to the driving-frequency tuning electrode for supplying a tuning voltage to the driving-frequency tuning electrode
Implementation Method 2
The second mobile mass is driven through the first mobile mass with oscillatory (translational or rotational) motion and, in the case of rotation of the microstructure about a gyroscope axis at an angular velocity, is subject to a Coriolis force proportional to the angular velocity
Implementation Method 3
the mobile mass is capacitively coupled to a plurality of fixed electrodes, which are fixed with respect to the supporting body, thus forming capacitors with variable capacitance. When the MEMS device operates as a sensor, movement of the mobile mass with respect to the fixed electrodes, due to the action of forces acting thereon, varies the capacitance of the capacitors
Data Source
AI summary
A MEMS gyroscope can include a supporting structure and a mobile mass elastically suspended from the supporting structure in a driving direction and in a sensing direction, mutually perpendicular. A driving structure is coupled to the mobile mass for controlling a driving movement of the mobile mass in the driving direction at a driving frequency. A driving-frequency tuning electrode, distinct from the driving structure, faces the mobile mass. A driving-frequency tuner electrically coupled to the driving-frequency tuning electrode for supplying a tuning voltage to the driving-frequency tuning electrode.