Optimum design for ultra wideband Two stage Low Noise Amplifier (UWBLNA)

A Two stage, common gate in cascade with common source, ultra wideband low noise amplifier (UWBLNA) is analyzed and optimized for 1 to 16 GHz full band application. The common gate first stage is adopted for wideband input impedance matching. The common source stage provides a wideband gain. Two structures of (UWBLNA) are studied and optimized in order to achieve a maximum gain over a wide band of frequencies while noise figure (N.F) remains unchanged. Simulation results carried out sever improvement for the gain over a wideband of frequencies. The average optimized gain for the first structure is 21.15 dB with average improvement of 15.5 %. For the second structure the optimized gain is 15.3 dB with average improvement of 18.4 %. The optimized structures are compared and show a good performance over a wideband of frequencies.