System and method of scaling error signals of caseload second or

Details System and method of scaling error signals of caseload second or System and method of scaling error signals of caseload second or

1989-11-02

1991-10-29

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 34, H03M 302

Patent

active

050619284

ABSTRACT:
The invention relates to a method of cascading two or more sigma-delta modulators by applying an error signal representing the quantization error of a preceding modulator to a subsequent modulator in the cascade to be quantized therein, the quantized error signal being thereafter differentiated and subtracted from the quantized output signal of the preceding modulator. To improve the performance of the cascade, in the method according to the invention, the error signal is scaled before said subsequent modulator by a first factor smaller than 1, and the quantized error signal is scaled by a second factor substantially equal to the inverse of the first factor, before being subtracted from the quantized output signal of said preceding modulator.

REFERENCES:
patent: 4704600 (1987-11-01), Uchimura et al.
patent: 4733219 (1988-03-01), Reusens
patent: 4843390 (1989-06-01), Van Bavel et al.
patent: 4862169 (1989-08-01), Van Bavel et al.
patent: 4876542 (1989-10-01), Van Bavel et al.
patent: 4920544 (1990-04-01), Endo et al.

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