Linearized multibit digital/analog converter and its use in a multibit delta-sigma analog/digital converter

摘要

A multibit digital/analog converter has M delta-sigma modulators and a sorting logic unit. The sorting logic unit selects a number of DA elements based on an input signal of the converter in such a way that the DA elements associated with the quantizers having the largest output signal are selected. The sorting logic unit provides output signals which are fed back negatively. Oversampling and changing the allocation of the DA elements eliminates the error influence of the DA elements on the linearity with relatively little complexity.