Digital-to-analog converter, chip, and electronic device

A digital-to-analog converter comprising:

• a sampling resistor network circuit, an operational amplifier, a feedback resistor, and a compensation current generation circuit,
• wherein the sampling resistor network circuit is configured to control a sampling resistance value of the sampling resistor network circuit based on a sampling codeword, and generate an output current based on a voltage difference between a first reference voltage from a first reference voltage terminal and a voltage at a first input terminal of the operational amplifier as well as the sampling resistance value;
• wherein a first end of the feedback resistor is coupled to the first input terminal of the operational amplifier, and a second end of the feedback resistor is coupled to an output terminal of the operational amplifier and a sampling voltage output terminal;
• wherein the compensation current generation circuit is configured to generate a compensation current based on the sampling codeword;
• and
• wherein the compensation current is used to compensate for an offset current generated by an offset voltage in the sampling resistor network circuit in order to make a sum of the compensation current and the offset current equal to a first constant, wherein the first constant is independent of the sampling codeword, and wherein the offset voltage exists between a second input terminal of the operational amplifier and the first input terminal of the operational amplifier.