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A Tunable Bandpass $\Sigma-\Delta$ Modulator with Novel Architecture  

Kim, Jae-Bung (Division of Electronics and Information Engineering, Chonbuk University)
Cho, Seong-Ik (Division of Electronics and Information Engineering, Chonbuk University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.2, 2008 , pp. 135-139 More about this Journal
Abstract
In this paper, tunable SC(switched capacitor) 2nd order bandpass $\Sigma-\Delta$(Sigma-Delta) modulator with novel architecture that can adjust the IF band center frequency by one coefficient value is proposed for data conversion in the IF(Intermediate Frequency) band. Its architecture can optionally adjust all the 2nd order noise transfer function in comparison with the conventional architecture. In order to adjust the center frequency, the conventional architecture needs the two variable coefficient values, basic clock and eight clocks. On the other hand, the proposed architecture can adjust the center frequency by one variable coefficient value and basic clock only.
Keywords
Bandpass ${\Sigma}{\Delta}$ Modulator; Tunable;
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  • Reference
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