Wideband common-gate low-noise amplifier with dual-feedback for simultaneous input and noise matching

Abstract

This work designs and implements a wideband common-gate (CG) low-noise amplifier (LNA) with dual-feedback using 0.18 µm CMOS technology. The design is based on a mechanism of dual-feedback, which is composed of a transformer and a g m -boosting feedback, to overcome the trade-off between noise and input matching in common-gate topology without consuming additional dc power. Simultaneously, the noise figure and power gain are improved. The implemented wideband CG LNA achieves an S11 of below −10 dB, a NF of 1.9 – 2.65 dB, a power gain of 13.5 – 16.5 dB, and an IIP 3 of −2 – 3 dBm, with a 3 dB gain bandwidth of 1 – 8 GHz; the chip consumes 10.8 mW.