On the design of tone-free /spl Sigma//spl Delta/ modulators

Traditional one-bit /spl Sigma//spl Delta/ modulators used for A/D and D/A conversion produce very predominant tones near half the sample rate which might intermodulate in the analog converter section and cause in-band tones. This paper demonstrates how the use of chaos can substitute dither as a means for extinguishing these tones. Especially, modulator feedback filters derived from noise transfer functions having an all-pass term seem very promising.<
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