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Putting the "FLEX" in flexible mobile wireless radios - A wideband continuous-time baudpass sigma-delta ADC software radios

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3 Author(s)
Ana Rusu ; Sch. of Inf. & Commun. Technol., R. Inst. of Technol., Stockholm ; Boxian Dong ; Mohammed Ismail

This article has provided a brief overview of the SigmaDelta ADC conversion technologies for SDRs. The wireless receiver challenges were identified, the ADC design considerations and SigmaDelta solutions were discussed, and a low-distortion CT BP SigmaDelta modulator architecture was presented. The article has shown that the proposed CT BP SigmaDelta modulator is suitable for implementing high-IF ADC, making possible the software radio in handhelds. The major challenges in implementing such a high-IF ADC are the power dissipation and the degree of configurability, programmability, and adaptability that can be achieved by applying digital tuning and adaptive calibration

Published in:

IEEE Circuits and Devices Magazine  (Volume:22 ,  Issue: 6 )