CIRCUIT FOR CORRECTING PHASE ERROR OF GYRO SENSOR, GYRO SENSOR SYSTEM AND METHOD FOR CORRECTING PHASE ERROR OF GYRO SENSOR
First Claim
1. A circuit for correcting a phase error of a gyro sensor, comprising:
- an offset detecting unit for detecting an offset due to the phase error included in a gyro output signal outputted by being demodulated from an output of the gyro sensor;
a variable frequency generating unit for generating a switching frequency varied according to the result detected in the offset detecting unit; and
a phase correcting unit including a switched capacitor switched according to the switching frequency generated in the variable frequency generating unit and supplying a gyro sensor driving signal from the output of the gyro sensor as a demodulation signal to demodulate the gyro output signal, wherein the gyro sensor driving signal being supplied as the demodulation signal is corrected in phase according to a signal transmission characteristic of the switched capacitor.
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Abstract
The present invention relates to a circuit for correcting a phase error of a gyro sensor, a gyro sensor system and a method for correcting a phase error of a gyro sensor. In accordance with one embodiment of the present invention, the circuit for correcting a phase error of a gyro sensor includes: an offset detecting unit for detecting an offset due to the phase error included in a gyro output signal outputted by being demodulated from an output of the gyro sensor; a variable frequency generating unit for generating a switching frequency varied according to the result detected in the offset detecting unit; and a switched capacitor switched according to the switching frequency generated in the variable frequency generating unit. And also, a gyro sensor system including the circuit and a method for correcting a phase error of a gyro sensor are proposed.
11 Citations
16 Claims
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1. A circuit for correcting a phase error of a gyro sensor, comprising:
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an offset detecting unit for detecting an offset due to the phase error included in a gyro output signal outputted by being demodulated from an output of the gyro sensor; a variable frequency generating unit for generating a switching frequency varied according to the result detected in the offset detecting unit; and a phase correcting unit including a switched capacitor switched according to the switching frequency generated in the variable frequency generating unit and supplying a gyro sensor driving signal from the output of the gyro sensor as a demodulation signal to demodulate the gyro output signal, wherein the gyro sensor driving signal being supplied as the demodulation signal is corrected in phase according to a signal transmission characteristic of the switched capacitor. - View Dependent Claims (2, 3, 4, 5)
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6. A gyro sensor system, comprising:
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a gyro sensor for outputting a sensor output signal according to a movement of an object through a sensor electrode by receiving a driving signal; a signal processing unit for receiving the sensor output signal from the gyro sensor, separating a gyro signal component included in the sensor output signal and outputting as a gyro output signal; an offset detecting unit for detecting an offset due to a phase error included in the gyro output signal outputted from the signal processing unit; a variable frequency generating unit for generating a switching frequency varied according to the result detected in the offset detecting unit; and a phase correcting unit for receiving the sensor output signal of the gyro sensor, converting a phase thereof and supplying a gyro sensor driving signal to the gyro sensor by feedback, wherein the phase correcting unit includes a switched capacitor switched according to a switching frequency generated in the variable frequency generating unit and supplies the gyro sensor driving signal corrected the phase thereof according to a signal transmission characteristic of the switched capacitor as a demodulation signal for demodulating the gyro output signal in the signal processing unit. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method for correcting a phase error of a gyro sensor, comprising:
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detecting an offset due to a phase error included in a gyro output signal outputted by being demodulated from an output of the gyro sensor; generating a switching frequency varied according to a result detected in detecting the offset; and supplying a gyro sensor driving signal from the output of the gyro sensor as a demodulation signal to demodulate the gyro output signal, wherein the gyro sensor driving signal being supplied as the demodulation signal is corrected in phase according to a signal transmission characteristics of a switched capacitor being switched according to the switching frequency. - View Dependent Claims (15, 16)
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Specification