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A self-centering and stiffness-controlled MEMS accelerometer.

Yiming Jin1,2, Zhipeng Ma1,2, Ziyi Ye1,2

  • 1School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, 310013 China.

Microsystems & Nanoengineering
|January 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel MEMS accelerometer with electrostatic stiffness tuning. It achieves precise measurements by actively controlling its reference position and stiffness, significantly reducing temperature-induced errors for high-performance applications.

Keywords:
Electrical and electronic engineeringSensors

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Area of Science:

  • Micro-Electro-Mechanical Systems (MEMS)
  • Inertial Sensors
  • Advanced Control Systems

Background:

  • MEMS accelerometers are crucial for various applications but suffer from temperature drift and instability.
  • Existing tuning methods often lack comprehensive control over critical parameters like stiffness and reference position.
  • Effective compensation for environmental factors is essential for high-performance inertial sensing.

Purpose of the Study:

  • To present a high-performance MEMS accelerometer with DC/AC electrostatic stiffness tuning.
  • To develop a dynamical model incorporating electrostatic tuning and temperature effects.
  • To implement a novel control strategy for enhanced stability and accuracy.

Main Methods:

  • Development of a dynamical model for a double-sided parallel plate (DSPP) MEMS accelerometer.
  • Implementation of DC/AC electrostatic stiffness tuning for effective stiffness adjustment and geometric offset calibration.
  • Design of a self-centering closed loop for optimal force-to-rebalance (FTR) positioning.
  • Integration of a stiffness closed-loop to prevent pull-in instability.
  • Real-time temperature drift compensation using reference position and DC tuning voltage adjustments.

Main Results:

  • Achieved a temperature drift coefficient (TDC) of approximately 7 μg/°C.
  • Demonstrated an Allan bias instability of less than 1 μg.
  • Successfully implemented a novel control approach combining self-centering, stiffness control, and temperature compensation.
  • Validated the effectiveness of electrostatic tuning for accelerometer performance enhancement.

Conclusions:

  • The proposed MEMS accelerometer with integrated control strategies offers superior performance and stability.
  • The novel control approach effectively mitigates temperature drift and ensures reliable operation.
  • This design represents a significant advancement in high-performance inertial sensing technology.