Highly linear wide-band differential LNA using active feedback as post distortion

The paper describes the design of a differential broadband LNA covering the frequency range from 800 MHz to 5 GHz in 65nm CMOS technology. The work proposes a novel linearization technique for high-frequency wide-band applications using an active feedback as post-distortion. The technique is applied to a wide-band differential common gate (CG) LNA employing noise cancellation method. Post-layout simulations exhibit that the proposed technique increases IIP3 and P1dB considerably to +11.9 and +1 dBm, respectively at 1.8 GHz. The LNA achieves voltage gain of 13.7-13.9 dB, noise figure of 3-3.28 dB, and S11 less than -10 dB, while consuming only 16.5 mW. The layout schematic occupies 0.515 × 0.220 mm² of chip area.