Patent ID: 7636056

Claim:
A delta sigma modulator including a first integration circuit, a second integration circuit for integrating an output of the first integration circuit, and a quantizer for quantizing an output of the second integration circuit, an output of the quantizer being feedbacked to the input side of the first integration circuit, the delta sigma modulator comprising: a first power source terminal for supplying a first operation power source voltage to the first integration circuit; and a second power source terminal for supplying a second operation power source voltage lower than the first operation power source voltage to the second integration circuit, wherein: the first integration circuit includes a first capacitor, a first switch for intermittently interrupting a charge/discharge current to the first capacitor, and a first drive circuit supplied with the first operation power source voltage to drive the first switch, and the second integration circuit includes a second capacitor, a second switch for intermittently interrupting a charge/discharge current to the second capacitor, and a second drive circuit supplied with the second operation power source voltage to drive the second switch.