A Fully Integrated LNA for 3-5 GHz UWB Wireless Applications in 0.18-μm CMOS Technology

摘要

In this paper,a fully integrated low noise amplifier (LNA) employing a cascode topology and an RC feedback network is proposed for an ultra-wideband (UWB) wireless system in a 0.18-onm RF CMOS technology.By using two singlestage cascode topologies,the function of both a single-end input and differential output is achieved.The wideband input impedance and noise matching is conducted by employing an RC feedback network,a degenerating inductor (Ls) and a gate one (Lg).The simulation results show that the average power gain (S21 or S31) is about 11 dB and the input return loss (S11) is less than -10dB over the whole frequency range of 3 to 5 GHz.In addition,the noise figure (NF) is from 2.5 to 3.5 dB over 3–5 GHz while consuming 49mW under a 1.8V single supply voltage.