Microelectromechanical gyroscope with compensation of quadrature signal components
First Claim
1. A device, comprising:
- a supporting body;
a sensing mass coupled to the supporting body and movable with respect to the supporting body according to a driving axis and a sensing axis;
a driving circuit that separately outputs a driving signal, a compensation conversion signal, and a reading conversion signal, the sensing mass receives the driving signal to maintain the sensing mass in oscillation according to the driving axis, the driving circuit including;
a phase-lock loop (PLL) circuit that generates a master clock signal and a quadrature clock signal, the quadrature clock signal being phase-shifted by 90°
with respect to the master clock signal;
a controller that generates a control signal based on the quadrature clock signal, the driving circuit configured to generate the driving signal based on the control signal;
an oscillator; and
a clock generator coupled to the PLL circuit and the oscillator, the clock generator configured to generate the compensation conversion signal and the reading conversion signal based on an output of the oscillator and the master clock signal;
a reading circuit coupled to the sensing mass, the reading circuit generates an internal transduction signal representative of a position of the sensing mass according to the sensing axis, receives the reading conversion signal, and generates an output signal representative of an angular speed of the supporting body based on the transduction signal and the reading conversion signal; and
a compensation circuit coupled to the reading circuit in a feedback loop, the compensation circuit receives the transduction signal and the compensation conversion signal, and generates a compensation signal based on the received transduction signal and the compensation conversion signal.
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Accused Products
Abstract
A gyroscope includes: a mass, which is movable with respect to a supporting body; a driving loop for keeping the mass in oscillation according to a driving axis; a reading device, which supplying an output signal indicating an angular speed of the body; and a compensation device, for attenuating spurious signal components in quadrature with respect to a velocity of oscillation of the mass. The reading device includes an amplifier, which supplies a transduction signal indicating a position of the mass according to a sensing axis. The compensation device forms a control loop with the amplifier, extracts from the transduction signal an error signal representing quadrature components in the transduction signal, and supplies to the amplifier a compensation signal such as to attenuate the error signal.
16 Citations
20 Claims
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1. A device, comprising:
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a supporting body; a sensing mass coupled to the supporting body and movable with respect to the supporting body according to a driving axis and a sensing axis; a driving circuit that separately outputs a driving signal, a compensation conversion signal, and a reading conversion signal, the sensing mass receives the driving signal to maintain the sensing mass in oscillation according to the driving axis, the driving circuit including; a phase-lock loop (PLL) circuit that generates a master clock signal and a quadrature clock signal, the quadrature clock signal being phase-shifted by 90°
with respect to the master clock signal;a controller that generates a control signal based on the quadrature clock signal, the driving circuit configured to generate the driving signal based on the control signal; an oscillator; and a clock generator coupled to the PLL circuit and the oscillator, the clock generator configured to generate the compensation conversion signal and the reading conversion signal based on an output of the oscillator and the master clock signal; a reading circuit coupled to the sensing mass, the reading circuit generates an internal transduction signal representative of a position of the sensing mass according to the sensing axis, receives the reading conversion signal, and generates an output signal representative of an angular speed of the supporting body based on the transduction signal and the reading conversion signal; and a compensation circuit coupled to the reading circuit in a feedback loop, the compensation circuit receives the transduction signal and the compensation conversion signal, and generates a compensation signal based on the received transduction signal and the compensation conversion signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system, comprising:
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a microprocessor; and a microelectromechanical gyroscope coupled to the microprocessor, the gyroscope including; a supporting body; a sensing mass coupled to the supporting body and movable with respect to the supporting body according to a driving axis and a sensing axis; a driving circuit that drives the sensing mass by a driving signal to maintain the sensing mass in oscillation according to the driving axis, the driving circuit outputs a compensation conversion signal and a reading conversion signal, each of the driving signal, the compensation conversion signal, and the reading conversion signal are separate signals output by the driving circuit, the driving circuit including; a phase-lock loop (PLL) circuit that generates a master clock signal and a quadrature clock signal, the quadrature clock signal being phase-shifted by 90°
with respect to the master clock signal;a controller that generates a control signal based on the quadrature clock signal, the driving circuit configured to generate the driving signal based on the control signal; an oscillator; and a clock generator coupled to the PLL circuit and the oscillator, the clock generator configured to generate the compensation conversion signal and the reading conversion signal based on an output of the oscillator and the master dock signal; a reading circuit coupled to the sensing mass, the reading circuit generates an internal transduction signal representative of a position of the sensing mass according to the sensing axis, receives the reading conversion signal, and generates an output signal representative of an angular speed of the supporting body based on the transduction signal and the reading conversion signal; and a compensation circuit coupled to the reading circuit in a feedback loop, the compensation circuit receives the transduction signal and the compensation conversion signal, and generates a compensation signal based on the received transduction signal and the compensation conversion signal. - View Dependent Claims (13, 14, 15)
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16. A method, comprising:
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generating, by a driving circuit, a driving signal; driving a sensing mass by the driving signal to maintain the sensing mass in oscillation according to a driving axis with a driving frequency, the sensing mass being coupled to a supporting body and movable with respect to the supporting body according to a driving axis and a sensing axis; generating by a phase-lock loop (PLL) of the driving circuit a master clock signal and a quadrature clock signal that is phase-shifted by 90°
with respect to the master clock signal;generating, by a controller of the driving circuit, a control signal based on the quadrature clock signal, the generating the driving signal including generating, by the driving circuit, the driving signal based on the control signal; generating, by a clock generator of the driving circuit, a compensation conversion signal and a reading conversion signal based on an output of an oscillator of the driving circuit and the master clock signal, each of the driving signal, the compensation conversion signal, and the reading conversion signal being separate signals output by the driving circuit; generating, by a reading circuit coupled to the sensing mass, a transduction signal representative of a position of the sensing mass according to the sensing axis; and generating, by a compensation circuit, a compensation signal based on the transduction signal and the compensation conversion signal. - View Dependent Claims (17, 18, 19, 20)
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Specification