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A 50Mhz-To-1.5Ghz Cross-Correlation CMOS Spectrum Analyzer for Cognitive Radio with 89dB SFDR in 1Mhz RBW

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5 Author(s)
Oude Alink, M.S. ; Comput. Archit. for Embedded Syst., Univ. of Twente, Enschede, Netherlands ; Klumperink, E.A.M. ; Soer, M.C.M. ; Kokkeler, A.B.J.
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Spectrum sensing for cognitive radio requires a high linearity to handle strong signals, and at the same time a low noise figure (NF) to enable detection of much weaker signals. Often there is a trade-off between linearity and noise: improving one of them degrades the other. Cross-correlation can break this trade-off by reducing noise at the cost of measurement time. An existing RF front-end in CMOS-technology with IIP3=+11dBm and NF<6.5dB is duplicated and attenuators are put in front to increase linearity (IIP3=+24dBm). The attenuation degrades NF, but by using cross-correlation of the outputs of the two frontends, the NF is reduced to below 4dB. In total this results in a spurious-free dynamic range (SFDR) of 89dB in 1MHz resolution bandwidth (RBW).

Published in:

New Frontiers in Dynamic Spectrum, 2010 IEEE Symposium on

Date of Conference:

6-9 April 2010