High Dynamic Range Design for ΣΔM with Wide Input Ranges

  • Authors:

  • Hung-Chuan Pai;Steven B. Bibyk

  • Affiliations:

  • Information Electronics Research Group, Department of Electrical Engineering, The Ohio State University, Columbus OH 43210 paih@er4.eng.ohio-state.edu;Information Electronics Research Group, Department of Electrical Engineering, The Ohio State University, Columbus OH 43210 bibyk@ee.eng.ohio-state.edu

  • Venue:
  • Analog Integrated Circuits and Signal Processing - Selected papers from the 1st Analog VLSI Workshop
  • Year:
  • 1999

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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.