Fourth-order cascaded sigma-delta modulator

Details Fourth-order cascaded sigma-delta modulator Fourth-order cascaded sigma-delta modulator

1993-08-26

1995-05-09

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375247, H03M 302

Patent

active

054144248

ABSTRACT:
A system and method for cascading three sigma-delta modulators involves applying an error signal representing the quantization error of a preceding modulator to a subsequent modulator. The error signal is scaled by a factor before being applied to a subsequent modulator. The quantized error signal of the subsequent modulator is then scaled by the reciprocal of the original scaling factor before being combined with the quantized outputs of the previous modulators. Combining the quantized outputs of the three modulators is performed so as to cancel the quantization error of the previous stages while shaping the noise at the last stage so that most of the noise is placed at high frequencies.

REFERENCES:
patent: 4704600 (1987-11-01), Uchimura et al.
patent: 4876542 (1989-10-01), van Bavel et al.
patent: 5061928 (1991-10-01), Karema
patent: 5084702 (1992-01-01), Ribner
patent: 5103229 (1992-04-01), Ribner
patent: 5148167 (1992-09-01), Ribner
patent: 5153593 (1992-10-01), Walden et al.
patent: 5283578 (1994-02-01), Ribner et al.

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