An 18-to-50 GHz 2-Element Phased-Array CMOS Transceiver with Dual-Resonator T/R Switch with Three-port Reconfigurable Network and Embedded Tunable Image Rejection Filter

This paper presents a 2-element multi-band phased-array transceiver covering FR2-NTN n510/n511/n512 bands and 5G FR2 n257/n258/n259/n260/n261/n262 bands in 65nm CMOS. Thanks to the proposed dual-resonator T/R switch with three-port reconfigurable network (TP-FRN), the transceiver can operate with two modes and achieves 18-to-50 GHz coverage. The measured peak OP1dB is 16.7 dBm with 27.3 dB S21 at 28 GHz in TX mode and the minimum noise figure (NF) is 7.1 dB with 35 dB S21 and -35.3 dBm IP1dB at 22 G Hz in RX mode. Benefiting from the notch filter based tunable image rejection filter, an image-rejection ratio (IMRR) of 28.2-to-64.7 dBc can be achieved for the full path (TX-to-RX). Utilizing the bidirectional mixer (Bi-Mixer) to reduce the power consumption and complexity of the LO phase-shifting based system. Each element front-end (FE) consumes DC power 244 mW from 1 V and 2 V in TX and 53 mW in RX, and the corresponding chip total power consumption is 434 mW and 337 mW. The full path link performance is validated with $\mathbf{4 0 0 M} \mathbf{~ 6 4 - Q A M ~ s i g n a l s ~ a n d ~}$ achieve EVM results better than -25 dB.