Compensation circuit for a TX-RX capacitive sensor
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United States of America Patent
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Jan 10, 2012
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N/A
app pub date -
Dec 11, 2008
filing date -
Dec 14, 2007
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Abstract
A capacitive sensor may include a transmit electrode and a receive electrode capacitively coupled with the transmit electrode. A capacitance sensing circuit senses a capacitance between the transmit and receive electrodes by applying a signal to the transmit electrode and rectifying a current waveform induced at the receive electrode. A compensation circuit reduces the effect of a mutual and parasitic capacitances of the transmit and receive electrode pair by adding a compensation current to the rectified current.
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