Patent ID: 7952507

Claim:
A digital to analog converter (DAC), comprising: a DAC input adapted to receive a multi-bit digital input; a DAC output adapted to output an analog output current in response to and indicative of the digital input; a plurality of sub-DACs; and a plurality of gain control registers comprising a separate gain control register corresponding to each of the plurality of sub-DACs; wherein currents output by the sub-DACs are combined to provide the analog output current that is output at the DAC output; wherein each said sub-DAC is adapted to receive a separate reference current that specifies a transfer function of the sub-DAC; and wherein a transfer function of the DAC is modifiable in a piece-wise linear manner by modifying one or more digital values stored in the gain control registers, which modifies one or more of the reference currents provided to the sub-DACs.