Sensor circuit integrated with signal processing circuit and charging circuit
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United States of America Patent
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Dec 3, 2013
Grant Date -
Apr 19, 2012
app pub date -
Apr 16, 2010
filing date -
Apr 17, 2009
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Abstract
A sensor circuit integrated with a signal processing circuit and a charging circuit. The sensor circuit has a sensor voltage source to which a sensor internal resonance is connected in series, the signal processing circuit having a capacitor to which the sensor voltage source is connected via a signal line of the charging circuit, and a switch. The charging circuit includes another capacitor connected to the signal line, and a drive circuit at an input side of which the other capacitor is connected and which has a transconductance equivalent to an internal resistance.
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