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A 2.4 GHz 87 μW low-noise amplifier in 65 nm CMOS for IoT applications
Modern Physics Letters B  (IF1.668),  Pub Date : 2021-09-24, DOI: 10.1142/s0217984921504856
Jingwei Wu, Benqing Guo, Huifen Wang, Haifeng Liu, Lei Li, Wanting Zhou

As the Bluetooth devices for the internet of things require extremely low-power dissipation to maintain longer battery life, a low-noise amplifier (LNA) as the main power-consuming part in the circuit needs more current-efficient topologies on power saving. This paper proposes a low-noise transconductance amplifier that combines the techniques of passive impendence transformation, $gm$-boosting technique, and current reuse, leading to a low power under the 1.2 V power supply. The transformer-based $gm$-boosted structure is applied in the four-transistor-stacked current-reuse topology leading to a $12×$ power saving. The proposed LNA simulated in 65 nm CMOS shows the NF of 3.3 dB and the IIP3 of −8 dBm, respectively, while dissipating 87 $μ$W dc power. Compared to the previous low-power LNA, this design has fairly low-power consumption and low NF while other performance metrics remain competitive.