Method of correction of the error introduced by a multibit DAC incorporated in aN ADC

摘要

A method of correction of the error in an output digital signal (Out) of an analog/digital converter (ADC) (100), in which said error is introduced by a multibit digital/analog converter (DAC) (125) incorporated in the ADC, comprises: providing a scrambling scheme (200) of input signals (th1-th8) to the DAC, the scrambling scheme defining a scrambling of the input signals in dependence of values of a group (R) of variables (r1-r7), to produce scrambled input signals (t1-t8); extrapolating from the scrambling scheme parameters (M-1) defining a transformation operated by the scrambling scheme on the input signals to obtain the scrambled input signals; assigning to the variables substantially uncorrelated values; on the basis of the parameters, of the substantially uncorrelated values and of the scrambled signals, calculating (905) coefficients (pj,pjrj) of a linear combination of vectors of a vector space, the linear combination of vectors corresponding to a vector of the vector space representative of the error introduced by the DAC; calculating (910-1,..., 910-7) the correlation of a signal (Res1d) containing the error introduced by the multibit DAC with each coefficient of the linear combination of vectors, to extract an estimation () of each vector; on the basis of the coefficients and the estimations of the vectors, calculating a linear combination (pjrj) representative of the estimation of the error introduced by the multibit DAC, and using the estimation of the error introduced by the DAC to correct the ADC output signal.