Importance

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Abstract

A switch capacitor unit for implementing a capacitive sensor includes a charging switch, a charge transfer switch, and a first switch. The charging switch is coupled between a first supply voltage and a circuit node to selectively couple a sensing capacitor to the first supply voltage through the circuit node. The charge transfer switch is coupled between the circuit node and a first terminal of a second capacitor to selectively couple the sensing capacitor through the circuit node to the second capacitor. The first switch is coupled between the circuit node and a second terminal of the second capacitor to selectively couple the second terminal to the sensing capacitor through the circuit node.

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First Claim