Invention Grant
- Patent Title: Mode-tuning sense interface
- Patent Title (中): 模式调谐感应接口
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Application No.: US13720984Application Date: 2012-12-19
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Publication No.: US09304155B2Publication Date: 2016-04-05
- Inventor: Baris Cagdaser , Derek Shaeffer , Joseph Seeger
- Applicant: Invensense, Inc.
- Applicant Address: US CA San Jose
- Assignee: INVENSENSE, INC.
- Current Assignee: INVENSENSE, INC.
- Current Assignee Address: US CA San Jose
- Agency: IPxLaw Group LLP
- Agent Maryam Imam
- Main IPC: G01R27/26
- IPC: G01R27/26 ; G01C19/5726 ; G01D5/24

Abstract:
A MEMS capacitive sensing interface includes a sense capacitor having a first terminal and a second terminal, and having associated therewith a first electrostatic force. Further included in the MEMS capacitive sensing interface is a feedback capacitor having a third terminal and a fourth terminal, the feedback capacitor having associated therewith a second electrostatic force. The second and the fourth terminals are coupled to a common mass, and a net electrostatic force includes the first and second electrostatic forces acting on the common mass. Further, a capacitance measurement circuit measures the sense capacitance and couples the first terminal and the third terminal. The capacitance measurement circuit, the sense capacitor, and the feedback capacitor define a feedback loop that substantially eliminates dependence of the net electrostatic force on a position of the common mass.
Public/Granted literature
- US20140167789A1 MODE-TUNING SENSE INTERFACE Public/Granted day:2014-06-19
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