An RF cascode BJT-LNA with shunt-series input matching

An RF low noise amplifier (LNA) is proposed using BJT cascode topology to provide gain with low bias current consequently lower power dissipation and lower noise figure (NF). The circuit was designed and simulated with SPICE using a bipolar model card. At 1 GHz, the LNA noise figure is 1.87 dB, forward gain is 14.3 dB, reverse isolation is -60 dB, and excellent third order intermodulation intercept point (IIP3) of 3 dBm are obtained. The LNA consumes 2.3 mA from a 2 V power supply.