Method and apparatus for accurate digital-to-analog conversion

A digital to analog converter comprises:

• a plurality of current sources;
• differential amplifier module that provides an analog output;
• and
• a plurality of switching modules, wherein each of the plurality of switching modules is operably coupled to a corresponding current source of the plurality of current sources, wherein a first set of the plurality of switching modules couples the corresponding current sources to the differential amplifier module in a first manner based on a digital input value and a second set of the plurality of switching modules couples the corresponding current sources to the differential amplifier module in a second manner based on the digital input value such that, over time, errors introduced by the coupling in the first manner substantially compensate for errors introduced by the coupling in the second manner.

A method for digital to analog conversion, the method comprises:

• receiving a digital signal that includes a plurality of bits;
• generating a first signal based on each bit of a first set of the plurality of bits that is in a first state and based on an inversion of each bit of a second set of the plurality of bits that is in the first state;
• generating a second signal based on each bit of the first set of the plurality of bits that is in a second state and based on an inversion of each bit of the second set of the plurality bits that is in the second state;
• and
• combining the first and second signals to produce an analog representation of the digital signal.

An apparatus for digital to analog conversion, the apparatus comprises:

• processing module;
• and
• memory operably coupled to the processing module, wherein the memory further comprises operational instructions that cause the processing module to:
• receive a digital signal that includes a plurality of bits;
• generate a first signal based on each bit of a first set of the plurality of bits that is in a first state and based on an inversion of each bit of a second set of the plurality of bits that is in the first state;
• generate a second signal based on each bit of the first set of the plurality of bits that is in a second state and based on an inversion of each bit of the second set of the plurality bits that is in the second state;
• and
• combine the first signal and the second signal to produce an analog representation of the digital signal.