Adaptive non-linearity identification and compensation using orthogonal functions in a mixed signal circuit

A mixed-signal Integrated Circuit (IC) comprising:

• a mixed-signal circuit that generates a non-linear error when generating an output, the mixed-signal circuit being modulated at least in part by an input signal;
• a non-linear-error subtractor for subtracting a non-linearity compensation signal from an internal signal within the mixed-signal circuit to compensate for the non-linear error and to generate a residual error,
• an Integral Non-Linearity (INL) identification and compensation circuit that receives the input signal and generates the non-linearity compensation signal, wherein the INL identification and compensation circuit comprises:
• an orthogonal kernel generator that receives the input signal and generates a plurality of orthogonal kernel signals from the input signal;
• and
• an error correlator having a plurality of paths, wherein each path in the plurality of paths correlates the residual error to an orthogonal kernel signal in the plurality of orthogonal kernels generated by the orthogonal kernel generator, the error correlator summing results from the plurality of paths to adaptively generate the non-linearity compensation signal,
• whereby INL errors within the mixed-signal circuit are identified and adaptively compensated for by subtracting the non-linearity compensation signal.