Digital-to-analog converter using noise-shaped segmentation

Details Digital-to-analog converter using noise-shaped segmentation Digital-to-analog converter using noise-shaped segmentation

1997-09-25

1999-11-02

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, H03M 300

Patent

active

059778997

ABSTRACT:
A segmentation circuit includes a digital noise shaper responsive to a stream of digital input words for producing a stream of first digital subwords, and a subtractor for subtracting each of the first digital subwords from a corresponding one of the digital input words to produce a stream of second digital subwords that are noise-shaped. The first and second digital subwords have smaller word lengths than the digital input words. The sum of each of the first and second subwords is equal to the corresponding digital input word. When the digital input words are noise-shaped, the first and second digital subwords are both noise-shaped. The segmentation circuit may be used in a noise-shaping digital-to-analog converter having a multi-bit loop quantizer.

REFERENCES:
patent: 5369403 (1994-11-01), Temes et al.
patent: 5404142 (1995-04-01), Adams et al.
patent: 5406283 (1995-04-01), Leung
patent: 5684482 (1997-11-01), Galton
X Xu et al, "The Implementation of Dual -Truncation .SIGMA. .DELTA. D/A Converters," IFFF Circuits & Sys.J., 1992, 4 pp.

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