On improving dynamic range of wideband multistage ΣΔ modulator using nonlinear oscillation

Teng Hung Chang*, Lan-Rong Dung, Jwin Yen Guo

*Corresponding author for this work

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

Abstract

This paper presents an improved architecture of the multistage (MASH) multibit sigma-delta modulators (ΣΔMs). The architecture can be immune to circuit nonidealities over a large portion of input range when oversampling ratio (OSR) is low, and hence the dynamic range (DR) can be improved. Our approach is based on two resonator topologies, high-Q cascade-of-resonator-with-feedforward (HQCRFF) and low-Q cascade-of-integrator- with-feedforward (LQCIFF). The key to improving DR is to use HQCRFF-based single-bit structure in the first stage and have the first stage oscillated. When the first stage oscillates, the coarse quantization noise vanishes and hence circuit nonidealities, such as finite op-amp gain and capacitor mismatching, do not cause leakage quantization noise problem. In addition, because of the in-band zeros introduced by the resonators, the proposed architecture enhances the suppression of the in-band quantization noise for wideband applications. As the results of simulation, the proposed MASH architecture can inherently have wide DR without using additional calibration techniques.

Original languageEnglish
Title of host publication2005 IEEE VLSI-TSA International Symposium on VLSI Design, Automation and Test,(VLSI-TSA-DAT)
Pages319-322
Number of pages4
DOIs
StatePublished - 1 Dec 2005
Event2005 IEEE VLSI-TSA International Symposium on VLSI Design, Automation and Test,(VLSI-TSA-DAT) - Hsinchu, Taiwan
Duration: 27 Apr 200529 Apr 2005

Publication series

Name2005 IEEE VLSI-TSA International Symposium on VLSI Design, Automation and Test,(VLSI-TSA-DAT)
Volume2005

Conference

Conference2005 IEEE VLSI-TSA International Symposium on VLSI Design, Automation and Test,(VLSI-TSA-DAT)
CountryTaiwan
CityHsinchu
Period27/04/0529/04/05

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