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Self-balanced navigation-grade capacitive microaccelerometers using branched finger electrodes and their performance for varying sense voltage and pressure

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2 Author(s)
Ki-Ho Han ; Digital Nanolocomotion Center, Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Young-Ho Cho

Presents a navigation-grade capacitive microaccelerometer, whose low-noise high-resolution detection capability is achieved by a new electrode design based on a high-amplitude anti-phase sense voltage. We reduce the mechanical noise of the microaccelerometer to the level of 5.5 μg/√Hz by increasing the proof-mass based on deep RIE process of an SOI wafer. We reduce the electrical noise as low as 0.6 μg/√Hz by using an anti-phase high-amplitude square-wave sense voltage of 19 V. The nonlinearity problem caused by the high-amplitude sense voltage is solved by a new electrode design of branched finger type. Combined use of the branched finger electrode and high-amplitude sense voltage generates self force-balancing effects, resulting in an 140% increase of the bandwidth from 726Hz to 1734 Hz. For a fixed sense voltage of 10 V, the total noise is measured as 2.6 μg/√Hz at the air pressure of 3.9torr, which is the 51% of the total noise of 5.1 μg/√Hz at the atmospheric pressure.

Published in:

Microelectromechanical Systems, Journal of  (Volume:12 ,  Issue: 1 )

Date of Publication:

Feb 2003

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