A 0.045mm2 0.1–6GHz reconfigurable multi-band, multi-gain LNA for SDR

A low area fully reconfigurable multi-band LNA array based on active feedback amplifiers with mixed resistive and switched inductor loads is presented. The 90 nm baseline digital CMOS implementation covers the entire frequency range of interest for SDR from 0.1 to 6 GHz with a dynamic gain range from 0 dB to 22 dB. A noise figure as low as 2.7 dB and an input-referred linearity IIP3 of -4 dBm at 16 dB gain is achieved. An IIP3 of +9 dBm is reached in low gain mode to allow for high signal and interferer power at the antenna input. The LNA draws between 10 and 26 mA from a 1.2 V supply. The active area of the array is only 0.045 mm².