METHOD OF CORRECTING THE GAIN OF A CAPACITIVE MEMBER, AND A DEVICE FOR IMPLEMENTING THE METHOD
First Claim
1. A method of correcting the gain of a capacitive member comprising electrodes that are movable relative to each other, with a remanent field established between the electrodes, wherein the method comprises the steps of:
- applying a reduced DC bias voltage to one of the electrodes, the voltage having a value below a threshold for which a remanent field generated by said reduced bias voltage can be measured;
measuring an output signal from the capacitive member; and
calculating a correction for the gain of the capacitive member as a function of the measured output signal.
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Abstract
A method of correcting the gain of a capacitive member having electrodes that are movable relative to each other including the steps of successively applying to one of the electrodes, reduced bias voltages having opposite signs and a common value below a threshold for which a remanent field generated by said reduced bias voltages can be measured, making corresponding measurements of the output signals from the capacitive member; taking an average, and correcting the gain of the capacitive member as a function of the measured output signal.
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Citations
10 Claims
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1. A method of correcting the gain of a capacitive member comprising electrodes that are movable relative to each other, with a remanent field established between the electrodes, wherein the method comprises the steps of:
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applying a reduced DC bias voltage to one of the electrodes, the voltage having a value below a threshold for which a remanent field generated by said reduced bias voltage can be measured; measuring an output signal from the capacitive member; and calculating a correction for the gain of the capacitive member as a function of the measured output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A device for correcting the gain of a capacitive member comprising electrodes that are movable relative to each other and means for applying a bias signal to one of the electrodes, wherein the device includes means for applying a reduced DC bias voltage to one of the electrodes at a value that is below a threshold for which a remanent field generated by said reduced bias voltage can be measured, means for measuring an output signal from the capacitive member, and means for correcting the gain of the capacitive member as a function of the measured output signal.
Specification