Stabilization scheme of delta-sigma modulator

Details Stabilization scheme of delta-sigma modulator Stabilization scheme of delta-sigma modulator

1996-04-09

1998-08-11

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

341143, 341150, H04B 1406

Patent

active

057938113

ABSTRACT:
An analog modulator employing .DELTA.-.SIGMA. transformation and comprising timings generator, at least a single operational-amplifier (OP-amplifier) filter of Biquadratic transfer function and saturation detection circuit, is provided. This novel approach solves the stability issue by controlling the switching timings of the single operation-amplifier biquadratic filter in the .DELTA.-.SIGMA. modulator. During normal operation, this high-order .DELTA.-.SIGMA. modulator constructed by the single OP-amplifier biquadratic filter functions a third-order or fourth-order modulator. As unstable condition occurs, via the saturation detection circuit and timings generator, the third-order or the fourth-order modulator functionally converts into and performs as a stable .DELTA.-.SIGMA. modulator of second-order. As a stable condition is restored after a recovery time, via controlling the timing signals, the modulator functionally resumes its normal function of third-order or fourth-order operation which has a high resolution.

REFERENCES:
patent: 4866442 (1989-09-01), Steim et al.
patent: 5243345 (1993-09-01), Naus et al.
patent: 5245344 (1993-09-01), Sooch
patent: 5379039 (1995-01-01), Charaska et al.
patent: 5446460 (1995-08-01), Cabler
patent: 5461381 (1995-10-01), Seaberg
patent: 5572107 (1996-11-01), Koch et al.
patent: 5603113 (1997-02-01), De Loe, Jr.

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