Title:
ANGULAR SENSOR AND DRIVE FEEDBACK FOR ADJUSTING ERROR
Document Type and Number:
WIPO Patent Application WO2002010678
Kind Code:
A8
Abstract:
The present invention relates to a system (36, 38) for nulling drive feedthrough error in a sensor (10) having first and second drive electrodes (15, 16) which impart vibratory motion to first and second proof masses (20, 22) in response to first and second opposite phase drive signals (V1, V2), and having first and second capacitances defined between the drive electrodes (14, 16) and their associated proof masses (20, 22). A mismatch between the first and the second capacitance is measured. Drive feedthrough caused by the measured capacitance mismatch is nulled by adjusting the relative amplitudes of the first and second opposite phase drive signals (V1, V2), whereby the ration of the amplitudes is proportional to the ratio of the first and second capacitances. A servo loop may adaptively effect the ratio of the amplitudes.
Inventors:
WARD PAUL A
Application Number:
PCT/US2001/041490
Publication Date:
August 15, 2002
Filing Date:
July 31, 2001
Export Citation:
Assignee:
DRAPER LAB CHARLES S (US)
International Classes:
G01C19/5719; (IPC1-7): G01B9/04
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