DocumentCode :
2128930
Title :
Stable one-bit delta-sigma modulators based on switching control
Author :
Zourntos, Takis ; Johns, David A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Volume :
3
fYear :
1998
fDate :
12-15 May 1998
Firstpage :
1597
Abstract :
We present a globally stable arbitrary-order single-bit delta-sigma modulator architecture with continuous-time loop filtering. Using Lyapunov arguments and the method of equivalent control, it is shown that stability is guaranteed for any input signal with peak magnitude less than L>0, where -L and +L denote the quantization levels. The design augments the conventional delta-sigma modulator with switching feedback and the use of distinct operating modes; the additional circuitry required for the implementation of these stabilizing measures is nominal. For a given noise transfer function and fixed oversampling ratio, the new architecture achieves the same peak signal-to-noise-plus-distortion ratio as a traditional delta-sigma modulator. The proposed design can also yield near-peak performance for inputs which destabilize the conventional delta-sigma data converter. Simulation results are provided for the proposed modulator and a comparable standard interpolative design
Keywords :
circuit stability; modulators; quantisation (signal); sigma-delta modulation; signal sampling; Lyapunov arguments; continuous-time loop filtering; equivalent control method; fixed oversampling ratio; input signal; interpolative design; noise transfer function; operating modes; peak magnitude; quantization levels; signal-to-noise-plus-distortion ratio; simulation results; stable one-bit delta-sigma modulators; switching control; switching feedback; Circuit noise; Circuit stability; Delta modulation; Digital modulation; Feedback circuits; Feedback loop; Filters; Quantization; State feedback; Transfer functions;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
ISSN :
1520-6149
Print_ISBN :
0-7803-4428-6
Type :
conf
DOI :
10.1109/ICASSP.1998.681758
Filename :
681758
Link To Document :
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