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A New DAC Mismatch Shaping Technique for Sigma–Delta Modulators

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2 Author(s)
Mohamed Aboudina ; Department of Electrical Engineering, University of California at Los Angeles, Los Angeles, CA, USA ; Behzad Razavi

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.

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IEEE Transactions on Circuits and Systems II: Express Briefs  (Volume:57 ,  Issue: 12 )