Abstract
MASH delta-sigma (ΔΣ) modulators consist of a cascade of several lower order single-loop modulators. In an ideal cascade, the quantization error from all but the last stage are digitally canceled. The drawback with a cascaded design is the requirement of precise matching of contributions from different quantizers to cancel lower order quantization noise from intermediate delta-sigma stages. This paper presents a new, adaptive improvement to the residue coupled MASH delta sigma modulator. The adaptive corrections significantly reduce the sensitivity to analog imperfections. The result is a simple MASH delta-sigma modulator with high precision. Simulations of a 1-1 MASH circuit structure with errors and corrections are included to confirm the theory.
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Finsrud, M., Høvin, M.E. & Lande, T.S. Adaptive Correction of Errors in Residue Coupled MASH ΔΣ Modulators. Analog Integrated Circuits and Signal Processing 36, 21–29 (2003). https://doi.org/10.1023/A:1024433210588
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DOI: https://doi.org/10.1023/A:1024433210588