A 3-14 GHZ Low Noise Amplifier for Ultra Wide Band Applications

This paper presents an ultra wide band (UWB) low noise amplifier (LNA) with very high gain, better input matching, low noise figure, better linearity and low power consumption. A dual source degenerated resistive current reuse is used as an input stage and a cascode stage with shunt-series peaking is used to enhance the bandwidth and reverse isolation. The proposed LNA achieves a peak power gain of 20.92 dB at 9 GHz while achieving a gain greater than 20.3 dB over 3 – 14 GHz bandwidth. The achieved noise figure is in the range of 3.72 – 4.78 dB, while the input matching and the output matching are kept below –9 dB and –10 dB respectively. The reverse isolation is below –52 dB throughout the entire band. This LNA ensures better linearity with an IIP3 of 4 dBm at 9 GHz with very low power consumption of 5.876 mW at 1 V supply.