Anzeige
Erschienen in:
2011 | OriginalPaper | Buchkapitel
7. Trellis Sigma-Delta Modulation
verfasst von : Erwin Janssen, Arthur van Roermund
Erschienen in: Look-Ahead Based Sigma-Delta Modulation
Verlag: Springer Netherlands
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
Abstract
Chapter seven presents a full analysis of the Trellis sigma-delta modulation algorithm. This algorithm is the first pruned look-ahead sigma-delta modulation algorithm found in literature. It is a derivative of the full look-ahead algorithm and uses concepts from Trellis (Viterbi) decoding, hence the name. In the Trellis sigma-delta modulation algorithm, at all times, a total number of 2
N
potential solutions (paths) are investigated, of which the most recent N symbols are different for all the solutions. The output symbol of the converter is found by tracing back any of the 2
N
paths L time steps. After the algorithm discussion a performance analysis is performed, which shows that the Trellis sigma-delta modulation approach results in a converter that has an improved linearity and better stability than a normal sigma-delta modulator, although the computational load is very high. Suggestions for an efficient implementation of the algorithm are provided as well.