A 28GHz CMOS Phased-Array Transceiver Featuring Gain Invariance Based on LO Phase Shifting Architecture with 0.1-Degree Beam-Steering Resolution for 5G New Radio

Abstract

This paper presents a CMOS implementation of 28-GHz 4-element phased-array transceiver for 5G new radio. The proposed LO phase shifting architecture realizes very fine 0.04° phase tuning step and gain-invariant feature. An 8-element transceiver demonstrates the measured 0.1-degree beam-steering resolution and less than 0.2dB gain variation over the whole phase tuning range. In as-meter distance, the transceiver achieves 6.4Gb/s in 256QAM for beam angle of ±50° together with a maximum data rate of 15Gb/s in 64QAM, and consumes 1.2W/chip in TX mode and 0.59W/chip in RX mode.