Sigma delta modulator

Details Sigma delta modulator Sigma delta modulator

1993-05-12

1994-05-10

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 28, H03M 302

Patent

active

053111818

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. The modulator can also be constructed as a completely digital circuit and used as a noise shaping circuit in a digital digital-to-analog converter.

REFERENCES:
patent: 3825831 (1974-07-01), Ishiguro
patent: 4107669 (1978-08-01), Tewksbury
patent: 4759038 (1988-07-01), Takahashi et al.
patent: 4772871 (1988-09-01), Suzuki et al.
patent: 4796004 (1989-01-01), Rich et al.
patent: 4937577 (1990-06-01), Rich et al.
patent: 4965867 (1990-10-01), Tsuchida et al.
patent: 5068661 (1991-11-01), Kaneaki et al.
A 17-bit Oversampling D-to-A Conversion Technology Using Multistage Noise Shaping, Yasuyuki Matsuya, Kuniharu Uchimura, Atsushi Iwata, Takao Kaneko, IEEE Journal of Solid-State Circuits, vol. 24, No. 4, pp. 969-975, Aug., 1989.
Manfred Dietrich, Signal-to-Noise Ratio Improvement of Interpolative Analog-to-Digital Converters, pp. 66-72.
Yasuyuki Matsuya, et al., A 16-Bit Oversampling A-to-D Conversion Technology Using Triple-Integration Noise Shaping, Dec. 1987, pp. 921-929, IEEE Journal of Solid-State Circuits.
Japanese Abstract-Noise Shaping Coder.
B. P. Agrawal, et al., Specification-Based Design of .epsilon..DELTA.M for A/D and D/A Conversion, pp. 1980-1983.

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