US Patent 9823798 Capacitive sensor device and method of operation

A capacitive sensor system includes a capacitive sensor device having a sense electrode that includes a first capacitor, a first supply voltage in , a first switch operable to couple the sense electrode to the first supply voltage during a first mode and an analog to digital converter during a second mode, a second switch operable to couple a second capacitor to a second supply voltage during the first mode and to an open circuit during the second mode, and a resistive element that includes a first terminal coupled between the first capacitor and the first switch, and a second terminal coupled between the second capacitor and the second switch.