A DEM-Free Sturdy MASH Delta-Sigma Modulator with a Highly-Linear Tri-level DAC
Refereed conference paper presented and published in conference proceedings


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AbstractMulti-stage noise shaping (MASH) Delta-Sigma modulators (DSMs) can achieve high-order noise shaping with single-bit quantizers, but they require high opamp gain for precise matching between the analog and the digital filters. The Sturdy MASH (SMASH) DSM relaxes the opamp gain requirement but multi-bit digital-to-analog converters (DACs) become necessary. The SMASH structure thus loses the inherent linearity arisen from the 1-bit DACs in the MASH structure, and often employ a dynamic element matching (DEM) scheme, which imposes a speed limit to the modulator. This work presents a DEM-free SMASH DSM by employing an inherently linear 3-level DAC in the first stage, which combines the advantages of both the MASH and SMASH structures. Simulations results are presented, validating the proposed architecture.
All Author(s) ListWei Jin, Kong-pang Pun
Name of ConferenceIEEE International Conference on Electron Devices and Solid-State Circuits 2019 (IEEE EDSSC 2019)
Start Date of Conference12/06/2019
End Date of Conference14/06/2019
Place of ConferenceXi'an, China
Country/Region of ConferenceChina
Year2019
Month6
LanguagesEnglish-United States
KeywordsDelta-sigma modulator, sturdy MASH, switched-capacitor circuits

Last updated on 2019-02-07 at 16:50