This application note provides general information, print layout and list of used components, circuit layout and measured data of a low noise amplifier at 1.9GHz using SIEMENS SIEGET®25 BFP420. This circuit is optimized for good return loss values. Data at 1.9 GHz (3V and 5mA): Gain=14 dB / IP3out=8dBm / NF=1.65dB / RLin >13dB / RLout>18 dB