SENSOR CIRCUIT ARRANGEMENT
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United States of America Patent
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Issued Date -
Nov 6, 2014
app pub date -
Apr 15, 2014
filing date -
May 3, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a sensor circuit arrangement, a capacitance of a sensor capacitor is measured by a circuit which supplies a corresponding sensor signal. The circuit comprises a differential amplifier with an input, an output and a feedback loop between the input and the output. It further comprises a first capacitor arranged in the feedback loop, and a switching arrangement for charging the sensor capacitor from a voltage source in a first phase and for transferring a charge from the sensor capacitor to the integrating capacitor in a second phase. The circuit further comprises a second capacitor arranged in parallel to the first capacitor in the second phase for limiting a gain of noise generated by the differential amplifier. The sensor circuit arrangement further includes a low pass filter for filtering the sensor signal.
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