Patent ID: 7292173

Claim:
A digital-to-analog converter (DAC), used for selecting one of at most 2 M+N reference voltages V q as the analog signal for output according to a (M+N)-bit digital signal, wherein V q represents a q th reference voltage, 1≦q≦2 M+N , and N and M are integers larger than zero; the DAC comprising: a reference voltage unit, comprising 2 M output terminals VR k , wherein VR k represents the k th output terminal, 1≦k≦2 M ; a control unit, coupled with the 2 M output terminals VR k of the reference voltage unit, used for respectively delivering at least a reference voltage among the reference voltages outputted from every said output terminal VR k to the 2 M output terminals of the control unit according to the N bits among the bits of the digital signal; and a decoding unit, coupled with the 2 M output terminals of the control unit, used for selecting one of the signals from the 2 M output terminals of the control unit as the analog signal according to the M bits among the bits of the digital signal, wherein each of the output terminals VR k respectively outputs reference voltages (k−1)·2^ N)+1 ˜V k·2^N in 2 N phases of an output period.