Low-Noise Amplifier with Wideband Feedforward Linearisation for Mid-Band 5G Receivers

This paper proposes a wideband linearisationtechnique for third-order intercept point (IP3) improvement inlow noise amplifiers (LNAs). The proposed LNA is designedfor mid-band 5G (3-4GHz) wireless receivers and it is basedon a cascode topology. An auxiliary transistor provides afeedforward correction path for third-order intermodulation(IM3) cancellation. The effects of the second harmonic on the IM3are also considered in the modelling. Theoretical and simulationanalysis of the circuit result in a DC power consumption of306mW from a supply voltage of 3V, an OIP3 of 30.8dBm, noisefigure (NF) of 0.94dB and 13.8dB of power gain are obtained.The LNA is simulated for a hybrid circuit implementation usinga 400um GaAs packaged transistor