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Band-Pass Continuous-Time Sigma-Delta Modulators with Widely Tunable Notch Frequency for Efficient RF-to-Digital Conversion

AuthorsMolina-Salgado, G.; Jovanovic-Dolecek, G.; Rosa, José M. de la
Issue Date2013
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEEInternational Midwest Symposium on Circuits and Systems (IWSCAS): 566-569 (2013)
AbstractThis paper presents a design methodology to synthesize band-pass continuous-time Sigma-Delta modulators with a widely programmable notch frequency for the efficient digitization of radio-frequency signals in the next generation of software-defined-radio mobile systems. The presented modulator architectures are based on a fourth-order loop filter ¿ implemented with two LC-based resonators ¿ and a finite- impulsive-response feedback loop to increase their flexibility and degrees of freedom, considering three different cases for the digital-to-analog converter waveform, namely: a return-to-zero, a non-return-to-zero and a raised-cosine waveform. In all cases, the notch frequency can be reconfigured from 0.1fs to 0.4fs, while keeping the noise shaping performance, the stability and low sensitivity to circuit-element tolerances. This feature can be combined with undersampling techniques to achieve an efficient and robust digitization of 0.5-to-5GHz signals with scalable resolution and programmable signal bandwidth.
DescriptionComunicación presentada al "MWSCAS 2013" celebrado en Columbus (E.E.U.U.) del 4 al 7 de Agosto de 2013
Appears in Collections:(IMSE-CNM) Comunicaciones congresos
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