A Micropower Tilt Processing Circuit
File(s)
Accepted version
Author(s)
Constandinou, TG
Georgiou, J
Type
Journal Article
Abstract
This paper describes a novel analogue circuit for extracting the tilt angle from the output of a linear MEMS accelerometer. The circuit uses the accelerometer signal together with the gravitational acceleration vector to generate the tilt signal. Using a current-mode representation with MOS devices operating in weak inversion, the appropriate trigonometric function has been realised to compute tilt. Furthermore, implementing a long-time constant filter to extract the mean tilt level provides adaptation to the static tilt level. Specifically, this circuit has been designed as part of an implantable vestibular prosthesis to provide inclination signals for bypassing dysfunctional otolith end-organs. The circuit has been fabricated in AMS 0.35um 2P4M CMOS technology and this paper presents the theory, implementation and measured results.
Version
Accepted version
Date Issued
2009-10-30
Citation
IEEE Transactions on Biomedical Circuits and Systems, 2009, 3 (6), pp.363-369
ISSN
1932-4545
Publisher
IEEE
Start Page
363
End Page
369
Journal / Book Title
IEEE Transactions on Biomedical Circuits and Systems
Volume
3
Issue
6
Copyright Statement
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Identifier
http://hdl.handle.net/10044/1/4287
Source Volume Number
3
Subjects
Tilt
Processing
Arcsine
Publication Status
Published