Patent ID: 7504978

Claim:
A digital-analog converter capable of easily extending the resolution, the digital-analog converter comprising: a voltage dividing unit including a plurality of resistors connected in series with each other between operating voltage terminals to divide operating voltages into a plurality of voltages at connection nodes of the plurality of resistors; a decoder unit providing a plurality of switching signals including a first switching signal for selecting a voltage and a second switching signal for controlling the current; a switch unit selecting two voltages from the plurality of voltages divided by the voltage dividing unit according to the first switching signal; a comparing unit comparing the two voltages with each other selected by the switching unit to output a reference current corresponding to a difference between the two voltages; a current control unit controlling a feedback current according to the second switching signal of the decoder unit; and an adding unit transmitting the feedback current to the current control unit and adding one voltage between the two voltages selected by the switch unit and a feedback voltage determined according to the feedback current.