This work presents a 0.18-μm CMOS multimodal biosensing SoC for stress monitoring. It integrates ECG, PPG, GSR, and ECH AFEs, a 920-MHz WuRx, a 2.4-GHz Tx, and a PMU for long-term wearable use. Key techniques include a shared CBIA for ECG/ECH, an enhanced pre-charge method for PPG, and automatic feedback adjustment for GSR. The chip achieves 0.32 μVrms IRN, 130 dB CMRR, 113.9 dB PPG DR, 99 dB GSR DR, and 125.8 μW total AFE power.

This work presents a multimodal stress-monitoring SoC integrating ECG, PPG, GSR, ECH, wireless transmission, a wake-up receiver, and power management on a single chip. Its key innovations include a shared CBIA for ECG/ECH, an enhanced pre-charge scheme for PPG, and automatic feedback adjustment for GSR. The proposed chip achieves high integration, low power, and comprehensive stress-related biomarker acquisition for wearable applications.

This work can be applied to smart rings, wristbands, patches, and other wearable devices. It addresses the limited sensing coverage, high power consumption, and low integration of current stress-monitoring products by integrating multimodal biosignal sensing, wireless communication, and power management into a single chip. It is well suited for digital health, remote healthcare, homecare, and next-generation wearable medical electronics.