Patent ID: 7564393

Claim:
An integrated circuit for digital to analog conversion, comprising: a first capacitor and a second capacitor; an operational amplifier comprising a first input terminal, a second input terminal and an output terminal, the second input terminal receiving a reference voltage; and a switching circuit comprising a plurality of switches, each switch being configured to switch in response to a corresponding switching signal of a plurality of switching signals, wherein the switching circuit is configured to connect the second capacitor between the output terminal and the first input terminal of the operational amplifier while sending a first voltage to a first terminal of the first capacitor and a second voltage to a second terminal of the first capacitor during a first period, and wherein the switching circuit is configured to connect the first capacitor between the output terminal and the first input terminal of the operational amplifier while sending a third voltage to a first terminal of the second capacitor and a fourth voltage to a second terminal of the second capacitor during a second period consecutively following the first period.