Noise analysis of the input matching circuits for UWB Low Noise Amplifiers

摘要

In this paper, Ultra Wide Band (UWB) Low Noise Amplifier (LNA) with different input matching networks, one with current reuse networks, the other with common gate and another with filter stage are presented. The shunt-series feedback is used to improve the bandwidth, noise figure, input matching and linearity. The proposed LNAs are designed using 90nm CMOS technology and its various performance parameters are analyzed using Agilent ADS simulator. The LNA with the capacitive current reuse circuit, achieves the least Noise Figure of 1.6dB. The reverse isolation (S12) is less than −50 dB for all the three LNA topologies. The maximum power gain (S21) of 31 dB is obtained by using resistive current reuse technique and the NF in the range of 1.6–4 dB is measured.