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This paper presents an Ultra-Wideband (UWB) Low-Noise Amplifier (LNA) which its frequency range is from 3.1 to 10.6 GHz using 0.18-μm CMOS at 25°C. Simulation results show that the IIP3 is about 1dBm at 6GH and the Noise Figure (NF) ranges from 3.41-4.47 dB over the band of interest. Input matching is better than -12.81dB, S12 below -27.51 dB, S22 below -13.05 dB, S21 10.16 ± 1 and the power consume is 6.36mW at 1V supply voltage. The proposed LNA topology is very suitable for UWB pulse-radio system applications.