On simple oversampled A/D conversion in L2(R)

  • Authors:
  • Z. Cvetkovic;M. Vetterli

  • Affiliations:
  • Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA;-

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2001

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Abstract

The accuracy of oversampled analog-to-digital (A/D) conversion, the dependence of accuracy on the sampling interval τ and on the bit rate R are characteristics fundamental to A/D conversion but not completely understood. These characteristics are studied for oversampled A/D conversion of band-limited signals in L2 (R). We show that the digital sequence obtained in the process of oversampled A/D conversion describes the corresponding analog signal with an error which tends to zero as τ2 in energy, provided that the quantization threshold crossings of the signal constitute a sequence of stable sampling in the respective space of band-limited functions. Further, we show that the sequence of quantized samples can be represented in a manner which requires only a logarithmic increase in the bit rate with the sampling frequency, R=O(|logτ|), and hence that the error of oversampled A/D conversion actually exhibits an exponential decay in the bit rate as the sampling interval tends to zero