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An ultra low power low noise amplifier for 3.1∼10.6 GHz UWB receivers

An ultra-low-power low noise amplifier (LNA) for ultra-wideband (UWB) receivers is proposed in this paper. The first stage of the amplifier employs a resistive shunt feedback topology and a parallel LC load to provide wideband input impedance matching. The current-reuse configuration is used to ensure the first and second amplifier transistors share the same bias current. By applying forward body bias technique, the proposed circuit can operate at a reduced supply voltage. The UWB LNA was fabricated using a chartered 0.18μm CMOS process. Operating in 3.1~10.6GHz, the maximum power gain is 11.4~12.2dB, the input and output reflection coefficient are lower than -10dB, and the noise figure (NF) is lower than 4.3dB, while the power consumption is only 1.9mW from a 0.8V supply voltage.