SIGMA-DELTA ANALOG-TO-DIGITAL CONVERTER AND METHOD

A sigma-delta analog-to-digital converter (10) having DEM (14) facilitated data weighted averaging to select specific unit elements of a negative feedback loop digital-to-analog converter (15), which DEM (14) is comprised substantially of transmission gates that contribute little to propagation dela...

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Bibliographic Details
Main Authors DAGHER, ELIAS, H, MILLER, MATTHEW
Format Patent
LanguageEnglish
French
German
Published 22.02.2006
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
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Summary:A sigma-delta analog-to-digital converter (10) having DEM (14) facilitated data weighted averaging to select specific unit elements of a negative feedback loop digital-to-analog converter (15), which DEM (14) is comprised substantially of transmission gates that contribute little to propagation delay. As a result, the feedback signal provided by the feedback loop is not more than one clock cycle behind the present coded output of the ADC (10) itself. As a result, higher resolution converters can be realized. The DEM (14) utilizes a repeating sequence to select specific unit elements. In some embodiments the direction of sequence usage is reversed in various ways to aid in reducing harmonic distortion.
Bibliography:Application Number: EP20030719402