A Resonant MEMS Accelerometer With 56ng Bias Stability and 98ng/Hz^1/2 Noise Floor

Abstract

This letter presents a high-performance resonant MEMS accelerometer comprising of a single force-sensitive vibrating beam element sandwiched between two inertial masses. The accelerometer demonstrates a noise floor of 98 ng/Hz^1/2 and a bias stability of 56 ng under ambient conditions, corresponding to a frequency noise floor of 0.77 ppb/Hz^1/2 and a frequency bias stability of 0.43 ppb. These are the best results achieved for a MEMS accelerometer employing the resonant sensing paradigm to-date.
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