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A low-power, wideband CMOS receiver for spectrum-sensing cognitive radio sensor networks is presented. The low-IF receiver equipped with an inverter-based LNA-balun and I/Q sub-threshold rectifier enables low-power and high-speed spectrum sensing. For further extension to support higher data-rate radio systems, our local oscillator provides a frequency-dividing function when a low-phase-noise signal...
This paper presents a brief overview of cognitive radio applications and discusses design challenges in implementing integrated circuits for spectrum sensing and wideband/reconfigurable transceivers. Our prototype chip of a cognitive radio receiver with multi-resolution, dynamic-range-scalable spectrum sensing capability over a wide frequency range of 30 MHz to 2.4 GHz is also described.
A 30-MHz–2.4-GHz complementary metal oxide semiconductor (CMOS) receiver with an integrated tunable RF filter and a dynamic-range-scalable energy detector for both white-space and interference-level sensing in cognitive radio systems is reported. The second-order RF filter has only two stacked transistors, and its use, in combination with a subsequent harmonic rejection mixer, results in wideband...
A 30MHz–2.4GHz CMOS receiver with a highly linear integrated tunable RF filter, as well as with a dynamic-range-scalable RSSI-based energy detector for both whitespace and interference-level sensing, is reported. The test chip, fabricated in 90-nm CMOS process, achieves over 42dB harmonic rejection including seventh-order harmonic without any external device, 67dB gain, 5–8dB NF, +1.7dBm in-band IIP3,...
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