Title :
Self-balanced navigation-grade capacitive microaccelerometers using branched finger electrodes and their performance for varying sense voltage and pressure
Author :
Han, Ki-Ho ; Cho, Young-Ho
Author_Institution :
Digital Nanolocomotion Center, Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fDate :
2/1/2003 12:00:00 AM
Abstract :
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.
Keywords :
accelerometers; capacitive sensors; microelectrodes; microsensors; silicon-on-insulator; sputter etching; 10 V; 1734 Hz; 19 V; 3.9 torr; SOI wafer; Si; branched finger electrodes; branched finger type; capacitive microaccelerometers; deep RIE process; electrode design; high-amplitude anti-phase sense voltage; high-resolution detection capability; mechanical noise; navigation-grade microaccelerometer; self force-balancing effects; sense voltage; square-wave sense voltage; Atmospheric measurements; Bandwidth; Electrodes; Fingers; Force measurement; Navigation; Noise generators; Noise level; Noise reduction; Voltage;
Journal_Title :
Microelectromechanical Systems, Journal of
DOI :
10.1109/JMEMS.2002.805043