Design of Wideband Low Noise Amplifier with Directional Coupler for Cognitive Radio Receiver and Navigation Applications

This paper presents a wideband low noise amplifier with low noise enhancement mode Pseudomorphic HEMT ATF- 54143 transistor. The software Agilent Advanced Design System (ADS) was used for simulation of the operation of the amplifier. The performance of the amplifier were recorded and analyzed. The aim of the paper is to give low noise figure, high gain and unconditional stability. The simulation results show that the LNA using pHEMT is absolutely stable with in the band range of 1.1-1.7 GHz, which includes the band of GPS, satellite, navigation systems and cognitive radio.