Data-directed scrambler for multi-bit noise shaping D/A converte

Details Data-directed scrambler for multi-bit noise shaping D/A converte Data-directed scrambler for multi-bit noise shaping D/A converte

1993-08-05

1995-04-04

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, H03M 166, H03M 106

Patent

active

054041422

ABSTRACT:
A scrambler for use with thermometer-code digital signals and having a number of interconnected identical switching cells in the form of swapper cells with two inputs and two outputs. A control signal determines whether the inputs are connected directly or reversely to the outputs. The control signal is developed by logic circuitry which receives as inputs the two swapper cell input bits and a state bit representing the integrated difference of past swapper output signals.

REFERENCES:
patent: 4703310 (1987-10-01), van de Plassche
patent: 4791406 (1988-12-01), Mehrgardt et al.
patent: 4851841 (1989-07-01), Sooch
patent: 5128317 (1992-08-01), Story
patent: 5221926 (1993-06-01), Jackson
patent: 5305004 (1994-04-01), Fattaruso
L. R. Carley, "A Noise-Shaping Coder Topology for 15+ Bit Converters", IEEE J. Solid-State Circuits, vol. SC-24, pp. 267-273, Apr. 1989.
B. H. Leung et al "Multibit Sigma-Delta A/D Converter Incorporating A Novel Class of Dynamic Element Matching Techniques", IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing vol. 39, No. 1, Jan. 1992, pp. 35-51.
A. V. Oppenheim et al, "Digital Signal Processing", Prentice-Hall, 1975, pp. 302-309.

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