Delta-sigma modulator and dithering method including a...

H - Electricity – 03 – M

Patent

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H03M 3/02 (2006.01)

Patent

CA 2731566

A delta-sigma modulator (100) including a dithering capability for eliminating idle tones is provided according to the invention. The delta-sigma modulator (100) includes a bitstream converter (107) configured to generate a digital signal output substantially corresponding to an analog signal input, a periodicity detector (111) coupled to the bitstream converter (107) and config-ured to detect periodicity in the digital signal output, and a dithering sequence generator (116) connected to and activated by the periodicity detector (111). The dithering sequence generator (116) generates a dithering sequence. The delta-sigma modulator (100) further includes a pulse-width modulation (PWM) generator (119) coupled to the dithering sequence generator (116) and receiving the dithering sequence. The PWM generator (119) modulates the dithering sequence onto the analog signal input of the delta-sigma modulator (100) as a dithering signal.

Modulateur delta-sigma (100) comprenant une fonction de tramage pour éliminer les tons neutres. Ce modulateur (100) comprend un convertisseur de flux binaire (107) configuré pour générer en sortie un signal numérique qui correspond pratiquement à lentrée de signal numérique ; un détecteur de périodicité (111) couplé à ce convertisseur de flux binaire (107) et configuré pour détecter la périodicité dans la sortie de signal numérique ; et un générateur de séquences de tramage (116) connecté à ce détecteur de périodicité (111) et activé par ce dernier. Le générateur de séquences de tramage (116) génère une séquence de tramage. Le modulateur delta-sigma (100) comprend également un générateur de modulation dimpulsion en largeur (PWM) (119) couplé au générateur de séquences tramage (116) et recevant ces séquences. Le générateur PWM (119) module chaque séquence de tramage et la transmet à lentrée de signal analogique du modulateur delta-sigma (100) sous la forme dun signal de tramage.

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