Method and apparatus for closed loop offset cancellation

Details Method and apparatus for closed loop offset cancellation Method and apparatus for closed loop offset cancellation

2007-01-25

2010-02-23

Kwok, Helen C. (Department: 2856)

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

Reexamination Certificate

active

07665361

ABSTRACT:
An apparatus (100, 200) and method (300) for sensing acceleration are provided. The method includes producing (305) a first signal in response to an acceleration sensed by a transducer, producing (310) a second signal based on the first signal, and actuating (315) the transducer in response to the second signal to remove offset in the transducer. The first signal represents the acceleration, and the second signal represents a low frequency component associated with an offset in the transducer. The apparatus (100) includes a transducer (102) producing a capacitance in response to the acceleration, a sensing system (104, 106, 108) producing a first signal from the capacitance representing the acceleration, and a compensation system (112, 110) coupled between the sensing system and transducer. The compensation system produces a second signal based on the first signal for substantially removing an offset of the transducer.

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International Search Report and Written Opinion for correlating PCT Patent Application No. PCT/US2008/050348, Applicant's file reference TS10089ZC, dated May 13, 2008.

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