34.1 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

Liheng Lou; Zeyu Zhou; Luyao Yuan; Yucheng Long; Gong Chen; Xiaoyu Li; Shaoqi Yang; Han Helen Cui; Ji Peng; Weichen Tao; Juncheng Deng; Yizhe Hu

doi:10.1109/isscc49663.2026.11409249

34.1 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

Digest of technical papers/Digest of technical papers - IEEE International Solid-State Circuits Conference 2026

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Authors: Liheng Lou, Zeyu Zhou, Luyao Yuan, Yucheng Long, Gong Chen, Xiaoyu Li, Shaoqi Yang, Han Helen Cui, Ji Peng, Weichen Tao, Juncheng Deng, Yizhe Hu

DOI: 10.1109/isscc49663.2026.11409249

Cited by: 0

References: 13

Abstract

A 2×4 phased-array SIL radar-on-chip in 22 nm CMOS is demonstrated for in-cabin vital-sign monitoring. Built on a forward-ΔΣ DPLL-locked multi-injection RTWO at 20 GHz, 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 1.42 mm2chip consumes 128 mW and achieves RR/HR errors

Fields of Study & Subjects

Radio Frequency Integrated Circuit Design Non-Invasive Vital Sign Monitoring Advancements in PLL and VCO Technologies

Publication details

Journal / source: Digest of technical papers/Digest of technical papers - IEEE International Solid-State Circuits Conference
Pages: 576–578
Publication date: 1 February 2026
Language: EN

References 13