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A Bulk-Micromachined Fully Differential MEMS Accelerometer With Split Interdigitated Fingers

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2 Author(s)
Aydin, O. ; METU-MEMS Res. & Applic. Center, Middle East Tech. Univ., Ankara, Turkey ; Akin, T.

This paper proposes a novel bulk-micromachined MEMS accelerometer employing split interdigitated sense fingers that provide a fully differential signal interface, where the accelerometer can be fabricated by a modified silicon-on-glass process using a silicon-on-insulator (SOI) wafer. The accelerometer combines the feasibility of fabricating large mass and high aspect ratio structures using bulk-micromachining together with the highly sensitive split interdigitated sense finger triplets that are connected with multilayer metal interconnects on an SOI-glass bonded wafer. The fabricated accelerometer is packaged for system level tests with a fourth-order Σ-Δ readout circuitry to evaluate its performance. The measurement results show that the accelerometer achieves a bias instability of 50 μg and a velocity random walk of 11.5 μg/√Hz. The accelerometer operates in a range of ±5 g with a nonlinearity of 1140 ppm.

Published in:

Sensors Journal, IEEE  (Volume:13 ,  Issue: 8 )