MEMS GYRO MOTOR LOOP FILTER
First Claim
1. A motor drive loop circuit for a micro-electro-mechanical system (MEMS) gyroscope, the motor drive loop circuit comprising:
- a motor configured to drive a proof mass in the MEMS gyroscope, the motor configured to cause the proof mass to oscillate at a primary-proof-mass mode; and
a minus-90-degree phase-shift twin-tee notch filter configured to;
provide a minus 90 degree phase at a motor resonance frequency equal to the primary-proof-mass mode;
suppress resonance at undesired mechanical modes of the motor during a startup of the motor; and
provide gain at the motor resonance frequency.
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Accused Products
Abstract
A motor drive loop circuit for a micro-electro-mechanical system (MEMS) gyroscope is provided. The motor drive loop circuit includes a motor configured to drive a proof mass in the MEMS gyroscope and a minus-90-degree phase-shift twin-tee notch filter. The motor is configured to cause the proof mass to oscillate at a primary-proof-mass mode. The a minus-90-degree phase-shift twin-tee notch filter is configured to: provide a minus 90 degree phase at a motor resonance frequency equal to the primary-proof-mass mode; suppress resonance at undesired mechanical modes of the motor during a startup of the motor; and provide gain at the motor resonance frequency.
36 Citations
20 Claims
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1. A motor drive loop circuit for a micro-electro-mechanical system (MEMS) gyroscope, the motor drive loop circuit comprising:
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a motor configured to drive a proof mass in the MEMS gyroscope, the motor configured to cause the proof mass to oscillate at a primary-proof-mass mode; and a minus-90-degree phase-shift twin-tee notch filter configured to;
provide a minus 90 degree phase at a motor resonance frequency equal to the primary-proof-mass mode;suppress resonance at undesired mechanical modes of the motor during a startup of the motor; and
provide gain at the motor resonance frequency. - View Dependent Claims (2, 3)
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4. A method to suppress undesired mechanical modes of a micro-electro-mechanical system (MEMS) gyroscope, the method comprising:
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coupling at least one pickoff signal to at least one respective minus-90-degree phase-shift twin-tee notch filter from at least one respective motor configured to drive at least one respective proof mass in the MEMS gyroscope; suppressing the undesired mechanical modes of the MEMS gyroscope at the at least one respective minus-90-degree phase-shift twin-tee notch filter; and passing at least one respective primary-proof-mass mode to the at least one respective motor from the at least one respective minus-90-degree phase-shift twin-tee notch filter. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A micro-electro-mechanical system (MEMS) gyroscope configured to suppress undesired mechanical modes of a micro-electro-mechanical system (MEMS) gyroscope during a startup of the MEMS gyroscope, the gyroscope comprising:
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at least one proof mass; at least one respective motor drive loop circuit, the at least one motor drive loop circuit including; at least one motor configured to drive the at least one respective proof mass in the MEMS gyroscope, the at least one motor configured to cause the at least one respective proof mass to oscillate at a respective at least one primary-proof-mass mode; and at least one respective minus-90-degree phase-shift twin-tee notch filter configured to;
provide a minus 90 degree phase at a motor resonance frequency equal to the at least one primary-proof-mass mode;
suppress resonance at undesired mechanical modes of the at least one motor during a startup of the at least one motor; and
provide gain at the motor resonance frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification