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Delta-sigma algorithmic analog-to-digital conversion

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4 Author(s)
G. Mulliken ; Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA ; F. Adil ; G. Cauwenberghs ; R. Genov

Delta-sigma modulation for analog-to-digital conversion resolves a number of bits logarithmic in the number of modulation cycles, and linear in modulation order. As an alternative to higher-order noise shaping, we present an algorithmic scheme that iteratively resamples the modulation residue, by feeding the integrator output back to the input. This yields a bit resolution linear in the number of cycles, similar to an algorithmic analog-to-digital converter. The scheme simplifies the design of the digital decimator to a single shifting counter, and avoids interstage gain errors in conventional algorithmic analog-to-digital converters. Experimental results from an integrated CMOS array of 128 converters show the utility of the design for large-scale parallel quantization in digital imaging and hybrid analog-digital computing.

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Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on  (Volume:4 )

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