Digital-to-analog converter

A digital-to-analog converter comprising:

• a decoder that receives a plurality of digital input signals to output a plurality of thermometer decode signals;
• a current supply part including a plurality of current sources, each of which operates in one of a sleeping mode and an operating mode under the control of the thermometer decode signals, the current supply part selectively outputting a plurality of switching power signals;
• and
• a switching part including a plurality of switching units, each of which operates in one of a sleeping mode and an operating mode under the control of the thermometer decode signals, the switching part outputting an analog signal under the control of the thermometer decode signals,
• wherein when an output of an (i−1)-th current source and an i-th thermometer decode signal are activated, an i-th current source operates in the operating mode to output an input current of an (i+1)-th current source and an i-th switching power signal to be input to an i-th switching unit, where “i” is a positive integer,
• wherein when the i-th switching power signal and the i-th thermometer decode signal are activated, the i-th switching unit operates in the operating mode to output the analog signal.

A digital-to-analog converter comprising:

• a decoder that receives a plurality of digital input signals to output a plurality of thermometer decode signals;
• a current supply part including a plurality of current sources, each of which operates in one of a sleeping mode and an operating mode under the control of the thermometer decode signals, the current supply part selectively outputting a plurality of switching power signals;
• and
• a switching part including a plurality of switching units, each of which operates in one of a sleeping mode and an operating mode under the control of the thermometer decode signals, the switching part outputting an analog signal under the control of the thermometer decode signals,
• wherein an i-th current source of the plurality of current sources operates in the operating mode when an output of an (i−1)-th current source and an i-th thermometer decode signal are activated, and the i-th current source is converted into the sleeping mode when at least one of the output of the (i−1)-th current source and the i-th thermometer decode signal are inactivated, where “i” is a positive integer,
• wherein an i-th switching unit of the plurality of switching units operates in the operating mode when an i-th switching power signal and the i-th thermometer decode signal are activated, and the i-th switching unit is converted into the sleeping mode when at least one of the i-th switching power signal and the i-th thermometer decode signal are inactivated,
• wherein when the i-th current source is converted into the sleeping mode, an (i+1)-th current source cascade-connected to an output terminal of the i-th current source to a last current source and the i-th switching unit to a last switching unit are converted into the sleeping mode.