A Low Voltage Low Power 5.7 GHz Variable Gain LNA in 0.18 um CMOS Technology

This paper presents a 2.4 GHz 0.18 μm CMOS single-ended Variable Gain Low noise Amplifier (VGLNA). The circuit is suitable for low voltage, low power operation, uses a current-reuse topology to increase linear gain and save power consumption. The common-source gain stages are stacked for minimum power dissipation while maintaining high gain. The VGLNA exhibits noise figure less than 3 dB and gain of 12 dB and 8 dB gain tuning range , P1dB of -2.8dBm. The VGLNA circuit dissipates 2.3 mW DC power from a supply voltage of 1.2 V. A gain/power figure of 5.2 dB/mW is achieved. Simulation results are presented