Adaptive Correction of Errors in Residue Coupled MASH ΔΣ Modulators

MASH delta-sigma (ΔΣ) modulators consist of a cascade of several lower order single-loop modulators. In an ideal cascade, the quantization error from all but the last stage are digitally canceled. The drawback with a cascaded design is the requirement of precise matching of contributions from different quantizers to cancel lower order quantization noise from intermediate delta-sigma stages. This paper presents a new, adaptive improvement to the residue coupled MASH delta sigma modulator. The adaptive corrections significantly reduce the sensitivity to analog imperfections. The result is a simple MASH delta-sigma modulator with high precision. Simulations of a 1-1 MASH circuit structure with errors and corrections are included to confirm the theory.

[1]  M. Rebeschini,et al.  A 16-b 160-kHz CMOS A/D converter using sigma-delta modulation , 1990 .

[2]  Gert Cauwenberghs,et al.  Adaptive digital correction of analog errors in MASH ADCs. I. Off-line and blind on-line calibration , 2000 .

[3]  Un-Ku Moon,et al.  Adaptive digital correction of analog errors in MASH ADCs. II. Correction using test-signal injection , 2000 .

[4]  M. Copeland,et al.  A 13 bit ISDN-band oversampled ADC using two-stage third order noise shaping , 1988, Proceedings of the IEEE 1988 Custom Integrated Circuits Conference.

[5]  R. Schreier,et al.  Delta-sigma data converters : theory, design, and simulation , 1997 .

[6]  Atsushi Iwata,et al.  A 16-bit oversampling A-to-D conversion technology using triple-integration noise shaping , 1987 .

[7]  Monica Finsrud,et al.  Second order MASH /spl utri//spl Sigma/FDM-solution with adaptive improvements , 2001, ICECS 2001. 8th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.01EX483).

[8]  Tor Sverre Lande,et al.  Adaptive correction of errors in second-order MASH /spl Delta//spl Sigma/FDM solution , 2001 .

[9]  M. Høvin,et al.  Delta-sigma modulators using frequency-modulated intermediate values , 1997, IEEE J. Solid State Circuits.

[10]  Ian Galton.  Granular quantization noise in a class of delta-sigma modulators , 1994, IEEE Trans. Inf. Theory.

[11]  A. Sripad,et al.  A necessary and sufficient condition for quantization errors to be uniform and white , 1977 .