Multibit sturdy mash δσ modulator with error-shaped segmented dacs for wideband low-power applications
Qi,Liang1; Sin,Sai Weng1; Martins,Rui Paulo2
Source PublicationProceedings of International Conference on ASIC
AbstractThis paper presents several techniques to enhance the resolution of sturdy multi-stage noise shaping (MASH) ΔΣ modulator (DSM). The proposed structure significantly suppresses the quantization noise (QN) by employing a high-resolution quantizer with a segmented MSB/LSB DAC feedback in the first loop as well as noise coupling techniques in both loops. Reducing QN of the first loop significantly decreases the output swings of the integrators, thus improving the stability of the first loop. Besides, the construction of one extra order shaping function mitigates the leakage of coarse QN introduced by a gain mismatch between MSB and LSB DACs of the high-resolution quantizer. Simulation results demonstrate the effectiveness of the proposed architecture to achieve high resolution while employing low-gain op-amps for all integrators.
URLView the original
Scopus ID2-s2.0-85082591117
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Document TypeConference paper
CollectionUniversity of Macau
Affiliation1.State-Key Laboratory of Analog and Mixed-Signal VLSI,Institute of Microelectronics-IME,University of Macau,Department of ECE,Faculty of Science and Technology,Macao
2.Instituto Superior Técnico,Universidade de Lisboa,Portugal
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Qi,Liang,Sin,Sai Weng,Martins,Rui Paulo. Multibit sturdy mash δσ modulator with error-shaped segmented dacs for wideband low-power applications[C],2019.
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