A system and method for adaptive sigma-delta modulation

H - Electricity – 03 – M

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H03M 3/02 (2006.01)

Patent

CA 2476967

A method and system for an adaptive sigma-delta (.SIGMA.-.DELTA.) modulator with one bit quantization that improves the signal-to-noise (SNR) of a .SIGMA.- .DELTA. modulator is presented. A difference signal is produced representing the difference between an analog input signal x(n) and a first adaptive feedback signal z(n), the amplitude of the analog input x(n) within a first range [-a, +a]. The difference signal is accumulated to produce a first accumulated signal representing an accumulation of the difference signal. The first accumulated signal is then quantized, creating a first quantized digital signal y0(n). Based on the first quantized digital signal y0(n) a first digital output signal z0(n) is produced, such that the instantaneous magnitude of the first analog feedback signal z(n) is substantially kept within the first range [-a, +a] and greater than the analog input signal's x(n) instantaneous magnitude. A digital-to-analog conversion is performed on the first digital output signal z0(n) to produce the first adaptive feedback signal z(n).

L'invention concerne un procédé et un système permettant d'obtenir un modulateur sigma-delta (.SIGMA.-.DELTA.) adaptif avec une quantification à 1 bit améliorant le rapport signal sur bruit (SNR) d'un modulateur .SIGMA.-.DELTA.. Ce procédé consiste à produire un signal différentiel représentant la différence entre un signal d'entrée analogique x(n) et un premier signal de rétroaction adaptif z(n), l'amplitude du signal d'entrée analogique x(n) étant comprise dans une première plage [-a, +a]. Le signal différentiel est cumulé pour produire un premier signal cumulé représentant une accumulation du signal différentiel. Le premier signal cumulé est ensuite quantifié pour créer un premier signal numérique quantifié y¿0?(n). Sur la base du premier signal numérique quantifié y¿0?(n), un premier signal de sortie numérique z¿0?(n) est produit, de façon que l'amplitude instantanée du premier signal de rétroaction analogique z(n) soit sensiblement maintenue dans la première plage [-a, +a] et supérieure à l'amplitude instantanée du signal d'entrée analogique x(n). Finalement, le premier signal de sortie numérique z¿0?(n) est soumis à une conversion numérique-analogique pour produire le premier signal de rétroaction adaptif z(n).

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