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US 12,698,969 B2Granted
Apparatus and methods for gyroscope signal demodulation
AssigneeAnalog Devices, Inc.
InventorJeff Yan
Life of this patent
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Abstract
Apparatus and methods for gyroscope signal demodulation are disclosed herein. In certain embodiments, a demodulation circuit for a microelectromechanical systems (MEMS) gyroscope includes a switched resistor filter that samples a gyroscope signal received from a microelectromechanical sensor. The switched resistor filter provides sampling with a controlled duty cycle and noise bandwidth limit to achieve high signal-to-noise ratio (SNR) performance.
Claims20
A demodulation circuit for a gyroscope, the demodulation circuit comprising:
- a plurality of switches configured to receive an amplitude modulated (AM) gyroscope signal;
- an output capacitor coupled to the plurality of switches, wherein the output capacitor is configured to output a demodulated gyroscope signal;
- and
- a clock duty cycle control circuit configured to control a duty cycle of the plurality of switches, the plurality of switches comprising a first switch connected between a first input node and a first output node and controlled by a first switch control signal from the clock duty cycle control circuit, a second switch connected between the first input node and a second output node and controlled by a second switch control signal from the clock duty cycle control circuit, a third switch connected between a second input node and the second output node and controlled by the first switch control signal, and a fourth switch connected between the second input node and the first output node and controlled by the second switch control signal.
1 more element
A method of signal demodulation for a gyroscope, the method comprising:
- receiving an amplitude modulated (AM) gyroscope signal as an input to a plurality of switches;
- outputting a demodulated gyroscope signal from an output capacitor coupled to the plurality of switches;
- and
- controlling a duty cycle of the plurality of switches using a clock duty cycle control circuit, the plurality of switches comprising a first switch connected between a first input node and a first output node and controlled by a first switch control signal from the clock duty cycle control circuit, a second switch connected between the first input node and a second output node and controlled by a second switch control signal from the clock duty cycle control circuit, a third switch connected between a second input node and the second output node and controlled by the first switch control signal, and a fourth switch connected between the second input node and the first output node and controlled by the second switch control signal.
1 more element
A gyroscope demodulation system comprising:
- a microelectromechanical sensor configured to output an amplitude modulated (AM) gyroscope signal;
- and
- a demodulation circuit comprising:
- a plurality of switches configured to receive the AM gyroscope signal;
- an output capacitor coupled to the plurality of switches, wherein the output capacitor is configured to output a demodulated gyroscope signal;
- and
- a clock duty cycle control circuit configured to control a duty cycle of the plurality of switches, the plurality of switches comprising a first switch connected between a first input node and a first output node and controlled by a first switch control signal from the clock duty cycle control circuit, a second switch connected between the first input node and a second output node and controlled by a second switch control signal from the clock duty cycle control circuit, a third switch connected between a second input node and the second output node and controlled by the first switch control signal, and a fourth switch connected between the second input node and the first output node and controlled by the second switch control signal.
4 more elements
Dependencies are inferred from the claim text.