Linearising sigma-delta modulators using dither and chaos

C. Dunn, M. Sandler
Proceedings of ISCAS'95 - International Symposium on Circuits and Systems  
Recent work has shown that high-order single-bit sigma-delta modulators suffer from lowlevel artifacts such as idle tones and noise modulation. Techniques that have been proposed to reduce or eliminate these errors include the application of dither inside the one-bit quantiser loop, and selecting a loop filter which makes the modulator chaotic. This paper compares the efficacy of these two approaches by simulating high-resolution sigma-delta modulators suitable for audio-conversion
more » ... ersion applications. Dynamic-range penalties for successful linearisation are determined for two types of dither signal and two classes of chaos.
doi:10.1109/iscas.1995.521591 dblp:conf/iscas/DunnS95 fatcat:nl4sh73gmnerlbxvrvuomvis3y