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
Download:
IMEKO-TC4-2002-045.pdf
DOI:
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Event details
IMEKO TC:
TC4
Event name:
TC4 Conference and Workshop 2002
Title:
4th International Conference on Advanced A/D and D/A Conversion Techniques and their Applications (together with 7th IMEKO TC4 Workshop on ADC Modelling and Testing)
Place:
Prague, CZECH REPUBLIC
Time:
26 June 2002 - 28 June 2002
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