Dual-Antenna RF CMOS Front-End for Interferer Removal in Ultra-Wideband Systems |
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Authors: | Dirk K Neumann Michael W Hoffman Sina Balkır |
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Affiliation: | (1) Systems Engineering & Patents Ubidyne GmbH, Lise-Meitner-Strasse 14, 89081 Ulm, Germany;(2) Department of Electrical Engineering, 209N Walter Scott Engineering Center, University of Nebraska-Lincoln, P.O. Box 880511, Lincoln, NE 68588-0511, USA |
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Abstract: | Many ultra-wideband (UWB) systems are challenged by strong jammers and narrowband interferers. Using two antennas, we demonstrate
a robust UWB radio frequency (RF) front-end design in a 0.25 μm mixed-signal complementary metal oxide semiconductor (CMOS)
technology. The proposed realization is capable of adaptively removing a high-power, narrowband interferer early in the receiver
chain avoiding front-end saturation and preserving UWB signal power. The early interferer removal resulting in interferer-free
demodulation is based on the least mean squares (LMS) algorithm and achieved through a novel combiner low-noise amplifier
and noise optimized filtering. Circuit level RF simulations of the proposed circuitry indicate a maximum improvement in signal-to-interference
ratio of 39.6 dB. |
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Keywords: | UWB Interferer removal Interferer rejection RF CMOS Front-end LMS algorithm |
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