JSSC 2020第11期RF & Wireless65nm

A Low-Power Backscatter Modulation System Communicating Across Tens of Meters Wi

一种低功耗反向散射调制系统，实现与商用Wi-Fi收发器的远距离通信

65nm CMOS, 2.8 µW唤醒接收功耗, -42.5 dBm灵敏度, 28 µW反向散射功耗, 17 dB镜像抑制

反向散射通信低功耗Wi-FiCMOSQPSK调制

▸创新点1：集成低功耗能量检测唤醒接收器（电路创新）。该接收器仅消耗2.8 µW功耗，灵敏度达到-42.5 dBm，支持超过30米的唤醒距离，显著降低了系统功耗并提升了唤醒效率。

▸创新点2：采用晶体稳定的多相本地振荡器（方法创新）。通过晶体稳定技术确保振荡器的高精度和多相输出，为单边带调制提供稳定的相位参考，提升了调制精度和系统可靠性。

▸创新点3：实现单边带QPSK调制与频率转换（系统创新）。利用单边带混频器实现QPSK调制，并通过频率转换将信号迁移到独立的Wi-Fi信道，实现了17 dB的镜像抑制，有效提高了通信质量和抗干扰能力。

▸创新点4：动态变化的复数阻抗终止天线（电路创新）。通过动态调整天线终端的复数阻抗，优化了信号反射效率，提升了反向散射通信的传输距离和信号质量，实测通信距离可达90米。

Abstract

This article presents the ﬁrst integrated circuit designed to enable low-power backscatter communication with commodity Wi-Fi transceivers. The developed chip operates by receiving a series of packets generated from a Wi-Fi access point (AP), which feeds into a low-power energy-detecting wake- up receiver that determines when backscatter communication should commence. Then, the Wi-Fi AP sends an additional packet that is intended to be backscatter modulated. To accom- plish this, the antenna rec