A LOW POWER, HIGH GAIN, LOW NOISE AMPLIFIER WITH IMPROVED NOISE FIGURE AND INPUT MATCHING FOR ULTRA WIDE BAND APPLICATIONS

Abstract

Abstract– In this paper, two low noise amplifiers (LNAs), one without feedback and another onewith active shunt partial feedback, are proposed for ultra wide band (UWB) applications. Both theproposed LNAs are designed using 90 nm CMOS technology and their performance parametersare analyzed by using post layout simulation. The proposed LNA without feedback achieves apower gain (S21) of 16.4 dB over the band of 3 – 10.4 GHz with NF (Noise Figure) in the range of4.9 – 5.2 dB. This high NF has been reduced to 2.4 – 2.7 dB by employing active shunt partialfeedback. The proposed LNA with active shunt partial feedback achieves a power gain of 15 dBover the band of 2 – 12 GHz. The input matching (S11) and output matching (S22) are less than –10 dB while maintaining the reverse isolation (S12) is less than -60 dB for both of the proposedcircuits. Both circuits, with and without active shunt partial feedback, maintain better linearitywith in-band third order input intercept point (IIP3) of – 1 dBm and – 4.242 dBm, respectively andconsume 3.643 mW and 2.862 mW of power while operating at 1 V power supply.