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JSSC 2020第9期RF & WirelessCMOS

A 28-GHz CMOS Phased-Array Beamformer Utilizing Neutralized Bi-Directional Techn

28GHz CMOS相控阵波束成形芯片，采用双向中和技术降低面积，支持5G毫米波双极化MIMO系统。
饱和输出功率15.1 dBm (TX), 噪声系数4.2 dB (RX), 最大EIRP 45.6 dBm, 支持15 Gb/s数据率
28GHz相控阵波束成形5G双极化MIMO
▸创新点1：中性化双向技术减少芯片面积。该方法通过共享发射和接收电路链，显著降低了芯片面积，同时保持了高性能，适用于5G毫米波双极化MIMO系统。
▸创新点2：主动双向矢量求和移相器。该移相器在发射和接收模式下均能实现高效相位调整，支持高分辨率相位控制，进一步优化了芯片面积和性能。
▸创新点3：支持高分辨率相位调整的TX/RX模式。该技术实现了在发射和接收模式下的高精度相位调整，确保了系统的灵活性和性能，适用于复杂的5G通信场景。
▸创新点4：实现了45.6 dBm的饱和EIRP。通过32个发射模式波束形成器，该系统在1米距离内支持15 Gb/s的最大SC模式数据速率和256-QAM的5G新无线电下行链路分组传输。
Abstract
This article presents a low-cost and area-efficient 28-GHz CMOS phased-array beamformer chip for 5G millimeter-wave dual-polarized multiple-in-multiple-out (MIMO) (DP-MIMO) systems. A neutralized bi-directional technique is introduced in this work to reduce the chip area significantly. With the proposed technique, completely the same circuit chain is shared between the transmitter and receiver. To further minimize the area, an active bi-directional vector-summing phase shifter is also introduced.