Patent ID: 7388532

Claim:
A digital-to-analog converter (DAC), comprising: a voltage divider unit, for providing an upper limit voltage, a lower limit voltage, and a plurality of reference voltages between the upper limit voltage and the lower limit voltage; a selection unit, coupled to the voltage divider unit, wherein the selection unit has a first output terminal and a second output terminal, the first output terminal is used to output an overdrive voltage, and the second output terminal is used to output a specific reference voltage corresponding to an input digital signal from among the reference voltages; a buffer unit, coupled to the selection unit, for generating an output voltage according to the overdrive voltage; and a detection unit, coupled to the selection unit and the buffer unit, for comparing the output voltage and the specific reference voltage, and outputting a regulation signal to the selection unit; wherein the selection unit regulates the overdrive voltage according to the regulation signal such that the output voltage is corresponding to the input digital signal.