A CMOS-Compatible Spectrum Analyzer for Cognitive Radio Exploiting Crosscorrelation to Improve Linearity and Noise Performance

Oude Alink, Mark S. and Klumperink, Eric A.M. and Kokkeler, André B.J. and Soer, Michiel C.M. and Smit, Gerard J.M. and Nauta, Bram (2011) A CMOS-Compatible Spectrum Analyzer for Cognitive Radio Exploiting Crosscorrelation to Improve Linearity and Noise Performance. IEEE transactions on circuits and systems I: regular papers, PP (99). pp. 1-14. ISSN 1549-8328

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Abstract:	A spectrum analyzer requires a high linearity to handle strong signals, and at the same time a low NF to enable detection of much weaker signals. This is not only important for lab equipment, but also for the spectrum sensing part of cognitive radio, where low cost and integration is at a premium. Often there is a trade-off between linearity and noise: improving one degrades the other. Crosscorrelation can break this tradeoff by reducing noise at the expense of measurement time. An existing RF frontend in CMOS-technology with IIP3=+11dBm and NF=5.5 dB is duplicated and attenuators are put in front to increase linearity to IIP3=+24 dBm. The attenuation degrades NF, but by using crosscorrelation of the outputs of the two frontends, the effective NF is reduced to around 5 dB. In total, this results in a spurious-free dynamic range of 88 dB in 1MHz resolution bandwidth.
Item Type:	Article
Copyright:	© 2011 IEEE
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Integrated Circuit Design (ICD) Computer Architecture for Embedded Systems (CAES)
Link to this item:	http://purl.utwente.nl/publications/79000
Official URL:	http://dx.doi.org/10.1109/TCSI.2011.2167266
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