Patent ID: 8629792

Claim:
An electric device, comprising: first, second and third selectors; a first node that is coupled to a first input of the first selector; a second node that is coupled to a first input of the second selector; a third node that is coupled to a second input of the first selector; a fourth node that is coupled to a second input of the second selector; a first switch that is coupled to the first node; a second switch that is coupled to the second node; a first capacitor that is coupled between the first switch and the third node; a second capacitor that is coupled between the second switch and the fourth node; a fifth node that is coupled between an output of the first selector and a first input of the third selector; a sixth node that is coupled between an output of the second selector and a second input of the third selector; and an analog/digital (A/D) converter that is coupled to an output of the third selector.