This paper presents the design of a low power LNA with second stage that uses a notch filter for DS-UWB application. The LNA employs a current reuse structure to reduce the power consumption and an active second order notch filter to produce band rejection in the 5 -6 GHz frequency band. The input reflection coefficient S11 and output reflection S22 are both less than -10 dB. The maximum power gain S21 is 15 dB while the maximum rejection ratio is over -10 dB at 4.8 GHz. The minimum noise figure is 5 dB. The input referred third-order intercept point (IIP3) is -7 dBm at 6 GHz. The power consumption is 6.4 mW from a 1-V power supply.