CAPACITIVE SENSING INTERFACE FOR PROXIMITY DETECTION
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United States of America Patent
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app pub date -
Dec 4, 2014
filing date -
Nov 26, 2013
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Abstract
A measuring circuit for a proximity sensor, comprising a charge amplifier in a floating voltage domain that is driven by a square waveform. The output signal is sampled synchronously with the voltage of the floating domain, and demodulated by measuring the voltage steps amplitude. This approach is compatible with a switched capacitor implementation and allows discriminating the capacity signal from the ambient noise; the latter can be evaluated independently.
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