A low power ultra-wideband CMOS LNA with inter stage technique

This paper present two new low power, low noise UWB LNA utilizing a inter stage technique with a simple high pass filter and third-order passive Chebychev filter input matching network is proposed. The broad band matching and the flat gain are two important factors for the broadband circuits. Besides those factors, the minimal Noise Figure (NF) and the lower power consumption are also desired. The LNA is designed in the standard 0.18 mum CMOS technology. The implemented two LNA (high pass filter and third-order passive Chebychev filter) present maximum power gain of 16.2 dB and 12 dB, and input return loss then -13.8 dB and -9.5 dB have been achieved and minimum noise figure (NFmin) of 2.05 dB and 2.9 dB was obtained in the frequency range of 3.1-10.6 GHz with a power dissipation of 9.65 mW under a 1.8-V power supply. The proposed UWB LNA demonstrates the highest power gain and lowest NF among the published works in 0.18 mum CMOS technology.