AN EFFICIENT ΔΣ NOISE-SHAPING ARCHITECTURE FOR WIDEBAND APPLICATIONS

János Márkus, Gábor C. Temes

Abstract

In this paper a new optimized multi-stage ΔΣ (Delta-Sigma) structure is proposed. The method combines the reduced-sample-rate architecture with the optimization of the zeros of the noise transfer function (NTF). To achieve this, the first stage of the decimation filter has to be modified as well. Applying this method one can avoid the SNR loss introduced by using the reduced-sample-rate second-stage. The SNR can actually increase for higher-order structures. Simulation results for a 2-0 MASH structure with an oversampling ratio of 4 are shown to verify the technique.

Keywords

multi-stage delta-sigma modulator, MASH, Leslie-Singh, reduced-sample-rate, modified (rotated) sinc filter

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IMEKO-TC4-2002-045.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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