The most efficient technique, based on LC ladder filtering, providing wide input matching in UWB LNA is first reviewed. Implemented with integrated inductors in a cascode topology, the circuit covers the 6 to 10 GHz upper frequency of European UWB and achieves an 8 dB maximum gain and 7.5 dB minimum noise figure for a 9mW power consumption. A transformer implementation of this Inductive Degeneration LC Filtering cascode architecture is also proposed. It leads to reduce by 50% the number of integrated inductors. Providing a 13 dB maximum gain from 3 to 5 GHz, the lower band of UWB, the circuit exhibits a 4 dB minimum NF under 9mW power consumption