Patent ID: 7525472

Claim:
An integration type analog to digital converter comprising: an integrator including an operation amplifier and a capacitor, the capacitor being electrically connected between an inverted input terminal and an output terminal of the operational amplifier; a first switch electrically connected to the capacitor in parallel; a second switch; a third switch wherein a terminal of the second switch and a terminal of the third switch are electrically connected to each other and to the inverted input terminal of the operational amplifier; a multiplier circuit; and a subtraction circuit, wherein an output terminal of the multiplier circuit and an input terminal of the subtraction circuit are electrically connected to each other and to a non-inverted input terminal of the operational amplifier; wherein an input terminal of the multiplier circuit is electrically connected to the other terminal of the second switch; and wherein an output terminal of the subtraction circuit is electrically connected to the other terminal of the third switch.