Digital-to-analog converter

A digital-to-analog converter, comprising:

• an amplifier receiving a reference voltage and a feedback voltage, and generating an output voltage according to the reference voltage and the feedback voltage;
• a voltage relaxation circuit coupled to an output end of the amplifier;
• a base current source coupled to the output end of the amplifier through the voltage relaxation circuit, and configured to generate a base current that is adjustable;
• a first weighting current source coupled to the output end of the amplifier through a current load and the voltage relaxation circuit, and generating a first weighting current that is adjustable between the current load or the voltage relaxation circuit and a reference ground end according to a first bit of input data;
• and
• at least one second weighting current source coupled to the output end of the amplifier through the voltage relaxation circuit, and generating at least one second weighting current according to at least one second bit of the input data.