The effects of switching noise on an oversampling A/D converter

This paper presents the results of an experimental study of the effects of switching noise in a high-resolution oversampling /spl Sigma//spl Delta/ modulator. An experimental test circuit emulates the embedding of such a modulator in the same substrate as a large amount of active digital circuitry. The modulator is a third-order cascade comprising a second-order /spl Sigma//spl Delta/ stage followed by a first-order stage, both employing 1 b quantisation. A 1 /spl mu/m CMOS implementation of this design provides a dynamic range of more than 100 dB at digital audio bandwidths.