Switching arrangement and method for a capacitive sensor
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United States of America Patent
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Sep 29, 2020
Grant Date -
Dec 28, 2017
app pub date -
Dec 30, 2015
filing date -
Dec 31, 2014
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Abstract
A capacitive sensor that includes: a sensing electrode having a capacitance to be measured; an alternating voltage source, configured to apply an alternating voltage to the sensing electrode; a capacitive first transfer device; a measurement circuit configured to measure the capacitance of the sensing electrode; and a switching arrangement. The switching arrangement is configured to alternately, in a first switching state, connect the first transfer device to the sensing electrode to enable a charge transfer from the sensing electrode to the first transfer device and, in a second switching state, connect the first transfer device to the measurement circuit to enable a charge transfer from the first transfer device to the measurement circuit.
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