Invention Grant
- Patent Title: Quadrature ADC feedback compensation for capacitive-based MEMS gyroscope
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Application No.: US15908660Application Date: 2018-02-28
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Publication No.: US10782131B2Publication Date: 2020-09-22
- Inventor: Gregory B. Arndt , Christopher C. Painter
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Fish & Richardson P.C.
- Main IPC: G01C19/5776
- IPC: G01C19/5776 ; H03M1/06 ; G01D5/24 ; H03D3/00 ; H03D3/02 ; H03G3/20

Abstract:
A quadrature ADC feedback compensation system and method for MEMS gyroscope is disclosed. In an embodiment, a MEMS gyroscope comprises an analog processing chain including a drive circuit for generating an analog drive signal and a sense circuit that is configured to generate an analog rate signal and an analog quadrature signal in response to a change in capacitance output by the MEMS gyroscope. A compensation circuit coupled to the sense circuit is configured to null the analog quadrature signal using the analog drive signal and a compensation value, and to adaptively compensate, in a digital processing chain, a quadrature-induced rate offset of a digital rate signal over temperature using a digital quadrature signal, the compensation value and temperature data.
Public/Granted literature
- US20190265036A1 QUADRATURE ADC FEEDBACK COMPENSATION FOR CAPACITIVE-BASED MEMS GYROSCOPE Public/Granted day:2019-08-29
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