Convertisseur a/n multibit de type sigma-delta a pleine echelle variable

Multi-bit sigma-delta analog to digital converter with a variablefull scale

Abstract

L'invention porte sur un convertisseur A/N multibit de type sigma-delta comportant un quantifieur, un circuit de filtrage en boucle, et un circuit de rétroaction numérique vers analogique, auxquels est associé un gain en boucle. On peut faire varier la pleine échelle dudit circuit de rétroaction ainsi que le gain combiné du quantifieur et de la boucle de filtrage. Plus spécifiquement le gain combiné du quantifieur et de la boucle de filtrage varie en proportion inverse de l'échelle totale du circuit de rétroaction de manière à maintenir le gain de la boucle à un niveau sensiblement constant.
A multi-bit sigma-delta analog to digital converter has a quantizer, a loop filter circuit, and a digital to analog feedback circuit. The quantizer, loop filter, and digital to analog feedback circuit have a loop gain associated therewith. The quantizer and loop filter have a combined gain associated therewith. The full-scale of the digital to analog feedback circuit is varied. The combined gain of the quantizer and loop filter is also varied. More specifically, the combined gain of the quantizer and loop filter is varied in inverse proportion to the full-scale of the digital to analog feedback circuit to maintain the loop gain at a substantially constant level.

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NO-Patent Citations (1)

    Title
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    CN-100514858-CJuly 15, 2009沃福森微电子股份有限公司字长减少电路
    JP-2010226762-AOctober 07, 2010Renesas Electronics Corp, ルネサスエレクトロニクス株式会社A/d変換回路を内蔵した半導体集積回路
    US-7948412-B2May 24, 2011Asahi Kasei Emd CorporationDelta-sigma modulator