Invention Application
- Patent Title: FORCE FEEDBACK ELECTRODES IN MEMS ACCELEROMETER
- Patent Title (中): 力学反馈电极在MEMS加速度计
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Application No.: US14295080Application Date: 2014-06-03
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Publication No.: US20160202366A1Publication Date: 2016-07-14
- Inventor: Ilker Ender Ocak , Chengliang Sun , Julius Ming-Lin Tsai , Sanchitha Nirodha Fernando
- Applicant: PGS Geophysical AS , Agency for Science Technology and Research (A*STAR)
- Applicant Address: NO Oslo SG Connexis
- Assignee: PGS Geophysical AS,Agency for Science Technology and Research (A*STAR)
- Current Assignee: PGS Geophysical AS,Agency for Science Technology and Research (A*STAR)
- Current Assignee Address: NO Oslo SG Connexis
- Main IPC: G01V1/18
- IPC: G01V1/18 ; G01P15/125 ; G01V1/09 ; G01V1/38

Abstract:
A microelectromechanical system (MEMS) accelerometer having separate sense and force-feedback electrodes is disclosed. The use of separate electrodes may in some embodiments increase the dynamic range of such devices. Other possible advantages include, for example, better sensitivity, better noise suppression, and better signal-to-noise ratio. In one embodiment, the accelerometer includes three silicon wafers, fabricated with sensing electrodes forming capacitors in a fully differential capacitive architecture, and with separate force feedback electrodes forming capacitors for force feedback. These electrodes may be isolated on a layer of silicon dioxide. In some embodiments, the accelerometer also includes silicon dioxide layers, piezoelectric structures, getter layers, bonding pads, bonding spacers, and force feedback electrodes, which may apply a restoring force to the proof mass region. MEMS accelerometers with force-feedback electrodes may be used in geophysical surveys, e.g., for seismic sensing or acoustic positioning.
Public/Granted literature
- US09945968B2 Force feedback electrodes in MEMS accelerometer Public/Granted day:2018-04-17
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