Abstract
A new design algorithm is introduced to improve the input ranges of Sigma-Delta Modulation (ΣΔM). Modified digital error correction techniques are proposed and employed to carry out the wide range DAC of a ΣΔ modulator. This design algorithm includes the advantages from both single-bit ΣΔM and multi-bit ΣΔM. This paper utilizes a second order lowpass ΣΔ modulator as an explanatory example to demonstrate our design process as well as the performance improvement. The analytical results from a quasilinear model are described to offer a theoretical explanation of the system performance. This algorithm can also be applied to bandpass and MASH architectures.
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