A bulk-micromachined fully-differential MEMS accelerometer with interdigitated fingers

2012-10-31
Aydin, Osman
Akın, Tayfun
This paper proposes a novel bulk-micromachined MEMS accelerometer employing interdigitated sense fingers that provide a fully-differential (FD) signal interface, where the accelerometer can be fabricated by a modified Silicon-on-Glass (M-SOG) process utilizing a <;111>; 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 high sensitive interdigitated sense finger triplets that are connected with multi-layer metal interconnects on an SOI-glass bonded wafer. The fabricated accelerometer is packaged for system level tests with a 4 th order Σ-Δ readout circuitry to evaluate its performance. The measurement results show that the accelerometer achieves a bias instability of 66.1 μg and a velocity random walk of 17.5 μg/√Hz, while operating in a range of ±8 g.

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Citation Formats
O. Aydin and T. Akın, “A bulk-micromachined fully-differential MEMS accelerometer with interdigitated fingers,” 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40571.