Patent ID: 7436340

Claim:
A current-cell type digital-to-analog converter for converting a digital code to the corresponding differential analog voltage between a first and a second analog voltage, comprising: a first output line; a second output line; a plurality of current cells, each of the cells includes a first transistor, a second transistor, a third transistor and a fourth transistor, the first transistor and the second transistor are connected in parallel between the first output line and common node, and the third transistor and the fourth transistor are connected in parallel between the second output line and the common node; and a control circuit which outputs a first control signal, a second control signal, a third control signal and a fourth control signal, wherein the first transistor is controlled by the first control signal, the second transistor is controlled by the second control signal, the third transistor is controlled by the third control signal, and the fourth transistor is controlled by the fourth control signal, wherein a level of the first control signal is changed after a level of the second control signal is changed, and wherein a level of the third control signal is changed after a level of the fourth control signal is changed.