Sigma-delta digital-to-analog conversion system and process thro

Details Sigma-delta digital-to-analog conversion system and process thro Sigma-delta digital-to-analog conversion system and process thro

1996-03-08

1998-05-05

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341144, H03M 300

Patent

active

057481261

ABSTRACT:
A conversion system and method is disclosed for converting between digital and analog data signals. The conversion system comprises a signal input line for each digital data signal, a reconstructor-resampler unit for each digital data signal, a combiner, a modulator, a digital-to-analog converter, and a signal output line. Each signal line input couples to the respective reconstructor-resampler unit for the digital data signal. Each reconstructor-resampler unit then couples to a combiner which couples to a modulator. The modulator couples to the digital-to-analog converter that couples to the signal output line from which an analog output signal is produced. The reconstructor-resampler comprises a sampling member coupled to the signal line input and a polynomial interpolator member coupled to the sampling member and the modulator. Also, the modulator operates at a predetermined, or fixed, frequency regardless of the sampling frequency of the digital data signal. The steps of the conversion method include inputting a digital data signal having a sampling frequency, reconstructing and resampling the digital data signal to generate a resampled data signal, performing noise-shaping on the resampled data signal to generate a x-bit data signal from a modulator operating at a predetermined frequency regardless of the sampling frequency of any of the digital data signals, and converting the x-bit data signal to an analog data signal. In addition, an analog-to-digital conversion system and method is disclosed that comprises a signal line input, a decimator, a reconstructor-resampler a signal output line, and a modulator operating at a predetermined frequency to convert an analog data signal to a digital data signal.

REFERENCES:
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patent: 5512898 (1996-04-01), Norsworthy et al.
Candy, James C. and Temes, Gabor C., "Oversampling Methods for A/D and D/A Conversion", IEEE Press, 1992, pp. 1-29.
Crochiere, Ronald E. and Rabiner, Lawrence R., "Interpolation and Decimation of Digital Signals--A Tutorial Review", Reprinted from Proc. IEEE, vol. 69, Mar. 1981, pp. 300-331 (pages in current version renumbered to 417-448).
Analog Devices AD1893 Data Sheet, pp. 1-20, Oct. 1994.
Gerald, C. F. and Wheatley, P. O., "Interpolating Polynomials", Applied Numerical Analysis, 3rd Edition, Chapter 3, pp. 171-181. (no date given).

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