A 3.5 GHz Low Noise, High Gain Narrow Band Differential Low Noise Amplifier Design for Wi-MAX Applications

This paper represents a 3.5 GHz narrow band differential LNA novel design for the improvement and reliability in 180μm CMOS technology. A 3.5 GHz proposed LNA designed structure is a fully integrated 3GHz high gain narrow band LNA by using differential cascode technique with modified inductive degenerated topology. The low power high gain, less noise, CMOS LNA is designed for wimax applications with UMC 180μm RF CMOS technology. This differential LNA has a noise figure of 2.65dB, supply voltage of 1.8V. The LNA has input return loss of -20 dB, output return loss of -14.6 dB, and Forward gain (S21) of 32dB. And 18.37dBm of 1dB compression point for the received signals that are below compression point. For the testing of inter modulation IIP3 is observed 4.16dBm .The designed LNA was simulated using 180μm RF spectre tool.