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Microsystem Technologies

, Volume 23, Issue 7, pp 2727–2738 | Cite as

Fringing capacitance and tolerance of DRIE effect on the performance of bulk silicon comb-drive actuator

  • Chunhua Cai
  • Ming Qin
Technical Paper

Abstract

A bulk silicon comb-drive actuator with low driving voltage and large displacement is presented in this paper. The bulk silicon comb-drive actuator is fabricated by a simple bulk micromachining process based on the low temperature Au–Au bonding technology. A cascade folded beam is designed to improve the displacement of comb-drive actuator at low driving voltages. The instability of the whole system decreases by utilizing unequal wide comb fingers design. The fringing capacitance and the fabrication tolerances together with their effects on the performances of the comb-drive actuators are also discussed. The measurement results show that the capacitance change rate and the displacement change rate of the comb-drive actuator are 1.5 fF/V2 and 0.125 μm/V2, respectively. The displacement of the actuator can reach 28.5 μm at 15 V driving voltages. The experimental results of the comb-drive actuator are in good agreement with the modified theoretical predictions.

Keywords

Slope Angle Stiffness Ratio Chemical Mechanical Planarization Fabrication Tolerance Comb Finger 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work is supported by the Fundamental Research Funds for the Central Universities (2014B02014), the National Natural Science Foundation of China (11574072) and the National High Technology Research and Development Program of China (863 Program, 2013AA041106).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.College of Internet of ThingsHohai UniversityNanjingChina

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