A process for compensating matching errors in analog/digital converters of cascaded structure and a corresponding converter

摘要

A test signal (TS) with given spectral characteristics is injected (201) at input to the quantizer stage (20) of the converter. The same test signal (TS) is subjected to cross-correlation (30) with a given signal (Y(z)) so as to generate (31) coefficients used for filtering (32) the quantization noise converted (27) into digital form. In this way, a compensation signal is obtained which is applied to the output signal of the quantizer stage (20) jointly with a first compensation signal obtained by applying, to the quantization noise converted into digital form, the same transfer function (28) of the converter. In this way a signal is obtained which, in addition to being used as the global output signal (Y(z)) of the converter, is also used for the aforesaid operation of cross-correlation with the test signal (TS).