A new DAC mismatch shaping technique for sigma-delta modulators

Authors:
Mohamed Aboudina;Behzad Razavi
Affiliations:
Department of Electrical Engineering, University of California, Los Angeles, CA;Department of Electrical Engineering, University of California, Los Angeles, CA
Venue:
IEEE Transactions on Circuits and Systems II: Express Briefs
Year:
2010

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Multibit delta-sigma modulator with noise-shaping dynamic element matching

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Abstract

A new ΣΔ modulator architecture that shapes digital-to-analog converter (DAC) mismatches in a manner similar to quantization noise shaping is proposed, allowing operation with low oversampling ratios, high-resolution quantizers, and compact logic. It is shown that the proposed architecture entails a smaller feedback logic delay than data-weighted-averaging techniques, providing a fourfold delay reduction for a 6-bit feedback DAC. The front-end integrator implementation also exhibits 25% less kT/C noise than conventional architectures.