A 128mW 2×4 Radar-on-Chip with Forward-ΔΣ DPLL-Locked Multi-Injection RTWO in 22nm CMOS Enabling ADC-Free Digitization and PS-Free Beamforming Demonstrated in In-Cabin Vital-Sign Monitoring

📋 论文概要

本文提出了一款基于22nm CMOS工艺的2×4相控阵雷达芯片，采用前向ΔΣ DPLL锁定多注入RTWO架构，同时实现调制解调、波束赋形和数据转换功能，用于车内生命体征监测。该芯片通过0dBm CW/PMCW信号消除呼吸干扰，将心脏信号提取的无杂散动态范围提升9dB，在1.42mm²面积内功耗仅128mW，呼吸率和心率误差小于±6bpm。

💡 主要创新点

• 提出前向ΔΣ DPLL锁定多注入RTWO架构，使单个振荡器同时承担调制解调、波束赋形和模数转换功能，实现无ADC数字化。
• 利用0dBm CW/PMCW信号进行呼吸干扰消除，将心脏信号提取的SFDR提升9dB，显著提高生命体征监测精度。
• 基于RTWO的波束赋形覆盖±48°视场，角度步进约15°，实现紧凑高效的相控阵雷达系统。

🏷 关键词

📄 原文摘要

Abstract A 2&4 phased-array SIL radar-on-chip in 22nm CMOS is demonstrated for in-cabin vitalsign monitoring. Built on a forward-ΔΣ DPLL-locked multi-injection RTWO at 20GHz, it concurrently serves as (de)modulator, beamformer, and data converter. The chip delivers 0dBm CW/PMCW for respiration cancellation, boosting SFDR by 9dB for cardiac extraction. RTWO-based beamforming covers ±48° FoV in ~15° AoA step. The 1.42mm2 chip consumes 128mW and achieves RR/HR errors <±6bpm with 1.2mW DSP on-chip. Vital-sign detection radars provide comprehensive, non-contact physiological monitoring, with applications spanning survivor detection, sleep analysis, clinical care, and in-cabin monitoring [1,2]. To meet these demands in compact and energy-efficient platforms, recent efforts have integrated radar functions onto a single chip, balancing sensitivity, efficiency, and scalability. Figure 34.1.1 illustrates a conceptual in-cabin monitoring (IM) system [35], including a driver monitoring system (D

👥 作者与机构

Liheng Lou1, Zeyu Zhou1, Luyao Yuan1, Yucheng Long1, Gong Chen2, Xiaoyu Li3, Shaoqi Yang1, Han Cui1, Ji Peng1, Weichen Tao1, Juncheng Deng1, Yizhe Hu1

University of Science and Technology of China, Hefei, China, 2National University of Singapore, Singapore, Singapore, 3Shanghai Jiao Tong University, Shanghai, China