Patent ID: 7535389

Claim:
A digital-to-analog (DAC) apparatus, comprising: a digital-to-analog converter (DAC) adapted to convert an input digital signal into an output analog signal; and a distortion correction module adapted to reduce distortion from the output analog signal, wherein the distortion correction module generates a correction sequence d nc from at least a portion of the input digital signal, and wherein the correction sequence d n is substantially determined by the following equation: d nc = β · ( d n - 1 d FS - 0.5 ) ·  d n - d n - 1  · R L · f c where d n is a nth value of the input digital signal, d n−1 is an (n−1)th value of the input digital signal, d FS is the full scale code of the DAC, R L is the load resistance at the output of the DAC, f c is the conversion rate of the DAC, and β is a constant.