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Micromachines 2018, 9(3), 128; https://doi.org/10.3390/mi9030128

Method of Measuring the Mismatch of Parasitic Capacitance in MEMS Accelerometer Based on Regulating Electrostatic Stiffness

1
Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, No.5 Electronics Research Institute of the Ministry of Industry and Information Technology, Guangzhou 510610, China
2
College of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
*
Author to whom correspondence should be addressed.
Received: 29 January 2018 / Revised: 25 February 2018 / Accepted: 2 March 2018 / Published: 15 March 2018
(This article belongs to the Special Issue MEMS Accelerometers)
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Abstract

For the MEMS capacitive accelerometer, parasitic capacitance is a serious problem. Its mismatch will deteriorate the performance of accelerometer. Obtaining the mismatch of the parasitic capacitance precisely is helpful for improving the performance of bias and scale. Currently, the method of measuring the mismatch is limited in the direct measuring using the instrument. This traditional method has low accuracy for it would lead in extra parasitic capacitive and have other problems. This paper presents a novel method based on the mechanism of a closed-loop accelerometer. The strongly linear relationship between the output of electric force and the square of pre-load voltage is obtained through theoretical derivation and validated by experiment. Based on this relationship, the mismatch of parasitic capacitance can be obtained precisely through regulating electrostatic stiffness without other equipment. The results can be applied in the design of decreasing the mismatch and electrical adjusting for eliminating the influence of the mismatch. View Full-Text
Keywords: MEMS accelerometer; mismatch of parasitic capacitance; electrostatic stiffness MEMS accelerometer; mismatch of parasitic capacitance; electrostatic stiffness
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Dong, X.; Yang, S.; Zhu, J.; En, Y.; Huang, Q. Method of Measuring the Mismatch of Parasitic Capacitance in MEMS Accelerometer Based on Regulating Electrostatic Stiffness. Micromachines 2018, 9, 128.

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