By Lucien Breems, Johan H. Huijsing

This article describes the layout and conception of continuous-time sigma-delta modulators for analogue-to-digital conversion in radio receivers. The book's major concentration is on dynamic diversity, linearity and gear potency facets of sigma-delta modulators, that are vitally important necessities to be used in battery operated receivers.

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Extra resources for Continuous Time Sigma Delta Modulation for A d Conversion in Radio Receivers Volume 634 (The Springer International Series in Engineering and Computer Science)

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M. Snelgrove, “A 950-MHz IF Second-Order Integrated LC Bandpass Delta-Sigma Modulator,” IEEE J. Solid-State Circuits, vol. 33, pp. 723-732, May 1998. M. 6 Summary fundamental performance limits, Kluwer Academic Publishers, Boston, 2000. , K. Koyama, D. Trager, F. Tam, L. Longo, “A 5-V Single-Chip Delta-Sigma Audio A/D Converter with 111 dB Dynamic Range,” IEEE J. Solid-State Circuits, vol. 32, pp. 329-336, March 1997. , E. Pajarre, S. Ingalsuo, T. Husu, V. Eerola, T. Saramaki, “A Stereo Audio Sigma-Delta A/D-Converter,” IEEE J.

6 Aliasing Due to the sampling process, any input frequency which is larger than half the sampling frequency will reflect into the frequency range This is the known problem of aliasing. Reduction of the aliasing effect is achieved by means of an analog filter in front of the sampler, to suppress the energy content of the frequency bands at multiples of the sampling frequency. An important property of a continuous-time modulator is that the sampling takes place at the output of the continuous-time loopfilter (in contrast to a discrete-time modulator where sampling is done at the input of the loopfilter).

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