Fully Integrated Backscattered WiFi 802.11b Transmitter with Active Harmonics and Image Rejection for 30dB IRR and 36dB HRR at 0.88µW

📋 论文概要

该论文提出了一种全集成、亚微瓦功耗的反向散射WiFi 802.11b发射机，通过有源谐波和镜像抑制技术解决了密集无线环境中的干扰问题。采用时域复滤波器、过采样和顺序RF开关使能，结合温度事件驱动校准，实现了30dB的镜像抑制比和36dB的谐波抑制比。

💡 主要创新点

• 首次在反向散射WiFi发射机中实现有源镜像和谐波抑制，无需数字滤波器。
• 采用温度事件驱动校准机制，动态调整脉冲基和可编程复阻抗，提升环境适应性。

🏷 关键词

📄 原文摘要

Abstract A sub-μW fully integrated backscattered 802.11b WiFi transmitter is introduced with active image and harmonics rejection for common dense wireless environments. Rejection is achieved via time-domain complex filters, and oversampling with sequential RF switch enablement (no digital filter). Temperature event-driven calibration adjusts the underlying pulse basis and programmable complex impedance. A 22nm test chip shows 30dB IRR (12dB better than prior art in Fig. 35.5.6), 36dB HRR (not shown priorly). Wireless environments are becoming increasingly denser in view of the exponential growth in the number of connected and coexisting devices, making efficient channel utilization a priority especially in unlicensed bands such as 2.4GHz. Pressing demand for lower transmission power, cost and form factor [1-3] has driven the recent evolution of backscattered transmitters [4-18], especially those compliant with existing standards [818]. Unfortunately (Fig. 35.5.1), backscattered transm

👥 作者与机构

Ruiyuan Yang, Karim Ali, Massimo Alioto

National University of Singapore, Singapore, Singapore