Concurrent dual-band 1.8/2.4 GHz LNA using miller effect of the gate-drain capacitor

Abstract

Future wireless devices become multi-mode communication systems in order to handle different standards. This paper presents a concurrent dual-band 1.8 and 2.4GHz low noise amplifier (LNA) in response to the growing market demands for more effective LNA's with a low supply voltage and power consumption. The impedance matching of the proposed LNA targeting the Wireless Local Area Network (WLAN) frequencies was obtained using the Miller effect of the intrinsic gate-drain capacitor, and using a Particle swarm optimization (PSO) technique. A folded cascode topology structure and the implementation of a forward body biased technique were employed for the reduction of the supply voltage. The proposed LNA performed well under a supply voltage of 0.3V consuming only 1.4mW of power. The LNA exhibited a power gain of 22dB and 18dB and an input return loss of −25dB and −33dB at the 1.8 and 2.4GHz band frequencies, respectively. The noise figure was below the required 2dB in both frequency bands.