Patent ID: 7283077

Claim:
A divide-add circuit, comprising: a first capacitor configured to store charges depending on a first voltage across the first capacitor; a third capacitor configured to store charges depending on a second voltage across the third capacitor; a first path control switch connected to the third capacitor, and configured such that the first and third capacitors are connected in series to each other therethrough; and a second capacitor connected in parallel to the first capacitor with respect to the first voltage, and configured to be connected in series to the third capacitor though the first path control switch; wherein a value of voltage, which is obtained by dividing the second voltage at an appropriate ratio that is proportional to a ratio of the second and third capacitors, is added to the first voltage, prior to connection between the second and third capacitors; and wherein a value of the first voltage across the first capacitor is calculated by a division and addition operation in a state in which the second capacitor is connected in series to the third capacitor through the first path control switch and the first and third capacitors are connected in parallel to each other.