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US 2013/0199294 A1Published application
Rate sensor with quadrature rejection
AssigneeSilicon Sensing Systems Limited
InventorsKevin Townsend, Michael Durston
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AssigneeSilicon Sensing Systems Limited
InventorsKevin Townsend, Michael Durston
Estimating the term…
An inertial sensor is described that has means for improving quadrature rejection The sensor is of a ring type, driven by a driver circuit, the sensor further comprising primary and secondary portions having corresponding signal pickoffs. The primary pickoff signal amplitude is controlled via an automatic gain control, the primary phase lock loop and VCO locks to the resonant frequency to provide the clocks for the synchronous detectors, the primary pickoff signals via the primary phase shift circuit is provided to the primary driver, the secondary pickoff signal being input into a detector circuit capable of detecting motion in the sensor. The secondary channel comprises a series of circuits that when operable in series significantly improve the quadrature rejection ability of the sensor. The circuits include a synchronous detector, passive and active filters and a decimator.
An angular velocity sensor comprising a ring type sensor having primary and secondary elements, the sensor further comprising primary and secondary channels connected to said primary and secondary elements, the primary channel comprising primary driver means for initiating and maintaining resonant oscillations in the primary elements, the secondary channel comprising detector means for detecting signals generated by the secondary elements in response to movement of the sensor, the detecting means including a differential amplifier and synchronous detectors generating an output signal dependent upon the movement of the sensor, wherein the secondary channel further comprises means for improving quadrature rejection in the secondary channel signal, said means comprising a series of circuits including a synchronous detector, passive and active filters and a decimator, said output signal being passed through the series of circuits and thereby suppressing high levels of quadrature signals.
A method of reducing quadrature rejection in the secondary channel signal of a MEMS angular velocity sensor comprising the steps of detecting the signal using a synchronous detector;
(canceled)
Dependencies are inferred from the claim text.