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On the design of tone-free ΣΔ modulators

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1 Author(s)
Risbo, L. ; Electron. Inst., Tech. Univ. Denmark, Lyngby, Denmark

Traditional one-bit ΣΔ 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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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:42 ,  Issue: 1 )