Sigma delta modulator with distributed prefiltering and feedback

Details Sigma delta modulator with distributed prefiltering and feedback Sigma delta modulator with distributed prefiltering and feedback

1990-01-31

1991-10-08

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 28, H03M 302

Patent

active

050558439

ABSTRACT:
A separate filter circuit is inserted between the D/A converter and the summing junction in the feedback path of a conventional sigma delta modulator. This additional filter allows control of the quantization noise transfer function profile independently of the forward signal transfer function. By proper tailoring of the transfer functions a third or higher order modulator can be constructed without instability developing.

REFERENCES:
patent: 3825831 (1974-07-01), Ishiguro
patent: 4411003 (1983-10-01), Su
patent: 4439756 (1984-03-01), Shenoi et al.
patent: 4467291 (1984-08-01), Roza
patent: 4528551 (1985-07-01), Agrawal et al.
patent: 4588981 (1986-05-01), Senn
patent: 4616349 (1986-10-01), Shirley
patent: 4796004 (1989-01-01), Rich et al.
IEEE Journal of Solid-State Circuits, vol. SC-17, No. 4, Aug. 1982, "Noise Sources and Calculation Techniques for Switched Capacitor Filters", Jonathan H. Fischer, pp. 742-752.
IEEE Journal of Solid-State Circuits, vol. SC-21, No. 6, Dec., 1986, "A 12-bit Sigma-Delta Analog-to-Digital Converter with a 15-MHz Clock Rate", Rudolf Koch, Bernd Heise, Franz Eckbauer, Eduard Engelhardt, John A. Fisher and Franz Parzefall, pp. 1003-1010.
IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988, "The Design of Sigma-Delta Modulation Analog-to-Digital Converters," Bernhard E. Boser and Bruce A. Wooley, pp. 1298-1308.
IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, "A 16-bit Oversampling A-to-D Conversion Technology Using Triple-Integration Noise Shaping", Y. Matsuya, K. Uchimura, A. Iwata, T. Kobayashi, M. Ishikawa, T. Yoshitome, pp. 921-929.
IEEE Journal of Solid-State Circuits, vol. 24, No. 2, Apr. 1989, "A 14-bit 80-kHz Sigma-Delta A/D Converter: Modeling, Design, and Performance Evaluation", Steven R. Norsworthy, Irving G. Post, H. Scott Fetterman, pp. 256-266.
AES An Audio Engineering Society Preprint, "A Stereo 16-bit Delta-Sigma A/D Converter for Digital Audio", D. R. Welland, B. P. Del Signore, E. J. Swanson, Crystal Semiconductor Corp., T. Tanaka, K. Hamashita, S. Hara, K. Takasuka, Asahi Kasei Microsystems, Inc., 2724 (H-12) pp. 1-11, FIGS. 1-13.
"A Novel Higher Order Interpolative Modulator Topology for High Resolution Oversampling A/D Converters", Wai Laing Lee, 1987, Massachusetts Institute of Technology Jun. 1987, pp. 1-135.

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