System comprising a mechanical resonator and method therefor
First Claim
1. A system comprising:
- a mechanical resonator;
an analog circuit, coupled to the mechanical resonator, and comprising a sense demodulator configured toreceive a mechanical resonator measurement signal having a quadrature error from the mechanical resonator, andextract the quadrature error signal from the mechanical resonator measurement signal using a quadrature clock; and
a threshold comparator, coupled to an output of the sense demodulator, and configured to output a sign that is representative of the quadrature error signal;
a digital quadrature controller, coupled to the threshold comparator, and configured togenerate a quadrature error compensation signal from the extracted quadrature error signal, andapply the quadrature error compensation signal to the mechanical resonator or the mechanical resonator measurement signal to reduce quadrature error in the mechanical resonator measurement signal.
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Abstract
A system is provided that includes a mechanical resonator, and an analog circuit coupled to the mechanical resonator. The analog circuit is arranged to receive a mechanical resonator measurement signal having a quadrature error from the mechanical resonator, and to extract a quadrature error signal from the mechanical resonator measurement signal using a quadrature clock. A digital quadrature controller is coupled to the analog circuit and is arranged to generate a quadrature error compensation signal from the extracted quadrature error signal and apply the quadrature error compensation signal to the mechanical resonator or the mechanical resonator measurement signal to reduce quadrature error in the mechanical resonator measurement signal error.
2 Citations
17 Claims
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1. A system comprising:
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a mechanical resonator; an analog circuit, coupled to the mechanical resonator, and comprising a sense demodulator configured to receive a mechanical resonator measurement signal having a quadrature error from the mechanical resonator, and extract the quadrature error signal from the mechanical resonator measurement signal using a quadrature clock; and a threshold comparator, coupled to an output of the sense demodulator, and configured to output a sign that is representative of the quadrature error signal; a digital quadrature controller, coupled to the threshold comparator, and configured to generate a quadrature error compensation signal from the extracted quadrature error signal, and apply the quadrature error compensation signal to the mechanical resonator or the mechanical resonator measurement signal to reduce quadrature error in the mechanical resonator measurement signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of generating a quadrature error compensating signal for a mechanical resonator within a micro-electro-mechanical system (MEMS) device, the method comprising:
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extracting a quadrature error signal from a mechanical resonator measurement signal using a quadrature clock; generating a quadrature error compensating signal based on the extracted quadrature error signal, wherein generating the quadrature error compensating signal comprises generating a quadrature error compensation signal through a binary search algorithm that successively reduces a quadrature error of the mechanical resonator measurement signal; and applying the quadrature error compensating signal to the mechanical resonator or the mechanical resonator measurement signal. - View Dependent Claims (15, 16, 17)
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Specification