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This paper demonstrates the design of a 3.1 GHz to 10.6 GHz low noise amplifier for UWB applications. It adopts a current-reused technique and a high-pass input matching network for high gain and low noise design. The designed LNA shows a 15.1 to 16.1 dB power gain and a good input matching of 50 Omega in the desired bands. The maximum variation of gain is less than 1 dB. The simulated noise figure is between 2.3 dB to 3.2 dB and the input return loss is below -10 dB, under 1.8V supply voltage in TSMC CMOS 0.18 mum technology.