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

Abstract

This paper proposes a wideband linearisation technique for third-order intercept point (IP3) improvement in low noise amplifiers (LNAs). The proposed LNA is designed for mid-band 5G (3-4GHz) wireless receivers and it is based on a cascode topology. An auxiliary transistor provides a feedforward correction path for third-order intermodulation (IM3) cancellation. The effects of the second harmonic on the IM3 are also considered in the modelling. Theoretical and simulation analysis of the circuit result in a DC power consumption of 306mW from a supply voltage of 3V, an OIP3 of 30.8dBm, noise figure (NF) of 0.94dB and 13.8dB of power gain are obtained. The LNA is simulated for a hybrid circuit implementation using a 400um GaAs packaged transistor.