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In this paper, we present an ultra-wideband 3.1-10.6 GHz low-noise amplifier employing an input three-section elliptic filter to achieve broadband input matching. The flat gain of the LNA is achieved by the inductor peaking load. The LNA is designed in the standard 0.13 mum CMOS technology. It achieved forward gain (S21) around 10 dB, input return loss (S11) of -9.8 dB, noise figure (NF) of 3.5 dB, input third-order-intercept point (IIP3) of 0.6 dBm, 1-dB compression point (P1dB) of -7.9 dBm, good phase linearity property (group-delay-variation is only plusmn9.4 ps), operates from 1.2 V power supply and consuming 5.4 mW.