The Low-Noise Amplifier (LNA) is the first and the important building block in a radiofrequency (RF) receiver since it must lead the signal from a receiving antenna at a level that can be properly addressed by the down-conversion architecture without adding noise. This paper describes a modified LNA architecture for Ultra-Wide Band (UWB) applications using a cascade inductive source degeneration topology. The proposed architecture was designed using CMOS 65 nm technology to operate in a broad frequency band from 0.8 GHz to 2.4 GHz which includes a large number of standards and RF applications. The designed UWB LNA shows a 14.35 dB power gain with a noise figure of 1.4 dB for power consumption of 29 mW, a 1-dB compression point ranging from -5 to 3 dBm, a IP3 ranging from 5 to 14 dBm, and an input return loss below -10 dBm.