Patent ID: 7830290

Claim:
A switched capacitor digital-to-analog converter (SC-DAC), comprising: an operational amplifier, having a non-inverting input terminal, an inverting input terminal and an output terminal, wherein the non-inverting input terminal is used for receiving a first reference level; a first capacitor, having one terminal coupled to the inverting input terminal, and another terminal coupled to the output terminal; a first switch, having a first terminal receiving a second reference level, and a second terminal coupled to the inverting input terminal; a second capacitor, having one terminal coupled to a third terminal of the first switch; a second switch, having a first terminal coupled to another terminal of the second capacitor, a second terminal receiving a first signal, a third terminal receiving a second signal, and a fourth terminal coupled to the output terminal; a third switch, having a first terminal coupled to the third terminal of the first switch; a third capacitor, having one terminal coupled to a second terminal of the third switch; a fourth switch, having a first terminal coupled to another terminal of the third capacitor, a second terminal coupled to the third terminal of the first switch, and a third terminal coupled to a third terminal of the third switch and the first terminal of the second switch; and a control unit, for controlling switching operations of the first, the second, the third and the fourth switches according to a state of a first digital logic bit.