An adaptive sigma-delta modulator with improved dynamic range

Chih Yuan Chen*, Tai Yue Wang, Shuenn Yuh Lee, Rong Guey Chang, Tsung Heng Tsai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper proposes a novel adaptive approach for sigmadelta modulators to significantly improve the dynamic range. Based on adjusting the signal power gain (SPG) of SDM, many dynamic-range (DR) curves can be obtained. A systematic approach with the proposed algorithm has been used to acquire the boundary constraints. Therefore, the wide dynamic range can be achieved without changing the original architecture and increasing the amount of hardware. A fourth order cascade of resonators with distributed feedback (CRFB) structure has been adopted to demonstrate the proposed method. This proposed method can be easily implemented by switched-capacitor circuits. The simulation results show that our work can really improve the dynamic range very well.

Original languageEnglish
Title of host publicationProceedings of the Fifth IASTED International Conference on Circuits, Signals, and Systems, CSS 2007
Pages245-248
Number of pages4
StatePublished - 2007
Event5th IASTED International Conference on Circuits, Signals, and Systems, CSS 2007 - Banff, AB, Canada
Duration: 2 Jul 20074 Jul 2007

Publication series

NameProceedings of the Fifth IASTED International Conference on Circuits, Signals, and Systems, CSS 2007

Conference

Conference5th IASTED International Conference on Circuits, Signals, and Systems, CSS 2007
Country/TerritoryCanada
CityBanff, AB
Period2/07/074/07/07

Keywords

  • Adaptive
  • CRFB
  • Dynamic range
  • Sigma delta modulator

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