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Proceedings Paper

Effects of dc and ac bias on the dynamic performance of microresonators
Author(s): Francis E.H. Tay; R. Kumaran; B. L. Chua; V. J. Logeeswaran
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Paper Abstract

It has been observed in many MEMS devices that there is a shift in resonant frequency due to voltage bias. The voltage bias may include either AC or DC bias or both. This paper reports on the significant discrepancy between the analytical and experimental resonant frequencies of folded beam micro resonators. Experimental results for the resonant frequency showed a consistent 20% discrepancy over theoretical and finite element results for MUMPs fabricated resonators. This difference in frequency is also seen in SOl fabricated devices. Possible causes of the discrepancy from tapered cross section of the flexure beams, dimensional variations and electrostatic spring effects are discussed and shown to contribute to the significant difference between analytical and experimental values. Inte11iCADTM electrostatic simulation was done to isolate the electrostatic spring effect and compared with the experimental observations. The compliance due to AC voltage has also been observed in SOl and MUMPs resonators and has been presented.

Paper Details

Date Published: 10 April 2000
PDF: 6 pages
Proc. SPIE 4019, Design, Test, Integration, and Packaging of MEMS/MOEMS, (10 April 2000);
Show Author Affiliations
Francis E.H. Tay, National Univ. of Singapore (Singapore)
R. Kumaran, National Univ. of Singapore (Singapore)
B. L. Chua, National Univ. of Singapore (Singapore)
V. J. Logeeswaran, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 4019:
Design, Test, Integration, and Packaging of MEMS/MOEMS
Bernard Courtois; Selden B. Crary; Kaigham J. Gabriel; Jean Michel Karam; Karen W. Markus; Andrew A. O. Tay, Editor(s)

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