A 4.5-mW Closed-Loop $\Delta\Sigma$ Micro-Gravity CMOS SOI Accelerometer
Authors:
- Reza AbdolvandRAReza Abdolvand
- Farrokh AyaziFAFarrokh Ayazi
- 20 November 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 41 (12) , 2983-2991
Abstract
In this paper, design, implementation and characterization of a 3-V switched-capacitor (SC) DeltaSigma CMOS interface circuit for the closed-loop operation of a lateral capacitive micro-gravity silicon-on-insulator (SOI) accelerometer is presented. The interface circuit is based on a front-end programmable reference-capacitorless SC charge amplifier and a back-end second-order SC DeltaSigma modulator. The accelerometer is fabricated through a dry-release high aspect-ratio reduced-gap process. By incorporating the low-Q transfer function of the microaccelerometer in a feedback loop, the system's dynamic range is improved by 20 dB, leading to a measured resolution of 4 mug/radicHz and an output dynamic range of 95 dB at 20 Hz. The bias instability is 2 to 8 mug for 12 hours. The chip is fabricated in the 0.5-mum standard CMOS process with an area of 2.25 mm2. The integrated circuit (IC) consumes 4.5 mW of powerKeywords
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