Journal
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
Volume 23, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0960-1317/23/8/085009
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Funding
- Austrian Research Promotion Agency [824187]
- MINECO (Spain) [DPI2012-31203]
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This paper presents a robust Q-control approach based on an all-electrical feedback loop enhancing the quality factor of a resonant microstructure by using the self-sensing capability of a piezoelectric thin film actuator made of aluminium nitride. A lock-in amplifier is used to extract the feedback signal which is proportional to the piezoelectric current. The measured real part is used to replace the originally low-quality and noisy feedback signal to modulate the driving voltage of the piezoelectric thin-film actuator. Since the lock-in amplifier reduces the noise in the feedback signal substantially, the proposed enhancement loop avoids the disadvantage of a constant signal-to-noise ratio, which an analogue feedback circuit usually suffers from. The quality factor was increased from the intrinsic value of 1766 to a maximum of 34 840 in air. These promising results facilitate precise measurements for self-actuated and self-sensing MEMS cantilevers even when operated in static viscous media.
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