Broadband sigma-delta modulator

Details Broadband sigma-delta modulator Broadband sigma-delta modulator

2006-04-18

2006-04-18

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

07030797

ABSTRACT:
A sigma-delta modulator converting digital input signals x(k) includes a first feedback loop of a spectrally formed output signal y(k) of the sigma-delta modulator and a second feedback loop of a spectrally formed differential signal e(k), obtained from an intermediate signal u(k) and the output signal y(k). The intermediate signal u(k) constitutes the differential signal of the input signal x(k) and the total signal r(k) of the first and second feedback loops. A quantizer determines the output signal y(k) based on the intermediate signal u(k), whereby k is the discrete independent time variable. The sigma-delta converter generates a skew between the output signal y(k) and the input signal x(k).

REFERENCES:
patent: 4692715 (1987-09-01), Spence
patent: 5055843 (1991-10-01), Ferguson, Jr. et al.
patent: 6225928 (2001-05-01), Green
patent: 6587061 (2003-07-01), Petrofsky
patent: 2002/0003847 (2002-01-01), Yamamoto et al.
patent: 199 37 246 (1999-08-01), None

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