A Reflection-Coefficient Sensor for 28GHz Beamforming Transmitters in 22nm FD-SOI CMOS

📋 论文概要

本文提出了一种用于28GHz波束赋形发射机的反射系数传感器，采用22nm FD-SOI CMOS工艺实现。该传感器能够检测天线阵列在锐角扫描或阻塞时负载变化导致的VSWR增加，为后续调整PA性能提供反馈。

💡 主要创新点

• 首次在22nm FD-SOI工艺中实现面向28GHz波束赋形发射机的反射系数传感器。
• 通过片上传感器实时检测天线负载变化，克服波束扫描时PA负载偏离问题。
• 集成于发射机前端，支持动态VSWR条件下的PA性能恢复。

🏷 关键词

📄 原文摘要

Millimeter-wave beamforming transmitters use antenna arrays to increase the EIRP by focusing the radiation pattern into a direction chosen by programming the TX phase shifters. However, under sharp scanning angles, the antennas load each other (see Fig. 26.4.1) such that in each antenna path the load seen by an individual PA in the output matching network (OMN) deviates from the load corresponding to boresight transmission. This situation can be accompanied by other external factors, such as antenna blockage, that increase VSWR. To restore the PA performance under increasing VSWR conditions, one can use a tunable matching network (TMN) that is controlled by the observed VSWR. The latter is then measured by a VSWR sensor, which is presented here. The overhead of such a sensor in terms of form factor, power consumption, and TX performance degradation should be minimal. The sensor described here can measure

👥 作者与机构

Yang Zhang, Giovanni Mangraviti, Johan Nguyen, Zhiwei Zong, Piet Wambacq

imec, Heverlee, Belgium