A 24-27 GHz wideband LNA in 40 nm RF CMOS Technology

In this paper, a single-ended wideband low noise amplifier (LNA) in the K-band is presented. By utilizing a two-stage common-source (CS-CS cascode) current reuse topology, the LNA circuit achieves low power consumption and low return loss. By adding another transistor as a third stage to amplify the signal, the LNA can further increase the gain while maintaining linearity. Implemented using a standard 40 nm RF CMOS process, the proposed LNA demonstrates more than $\mathbf{1 2} \mathbf{d B}$ gain and less than 5.1 dB noise figure across the 24 GHz to 27 GHz band, with input and output return loss below - 15 dB.