Key result
Robust 0.13-μm CMOS PPG readout chip achieves low power consumption of ~26 μW.
The proposed PPG readout chip design successfully compensates for large DC offsets and ambient light variation while maintaining low power consumption.
May support low-power wearable PPG sensors; leaves open clinical validation and integration in cardiovascular monitoring.
To overcome light interference, including a large DC offset and ambient light variation, a robust photoplethysmogram (PPG) readout chip is fabricated using a 0.13-μm complementary metal-oxide-semiconductor (CMOS) process. Against the large DC offset, a saturation detection and current feedback circuit is proposed to compensate for an offset current of up to 30 μA. For robustness against optical path variation, an automatic emitted light compensation method is adopted. To prevent ambient light interference, an alternating sampling and charge redistribution technique is also proposed. In the proposed technique, no additional power is consumed, and only three differential switches and one capacitor are required. The PPG readout channel consumes 26.4 μW and has an input referred current noise of 260 pArms.
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Kim et al. (2015) studied this question. Photoplethysmogram (PPG) readout chip was evaluated on Power consumption and input referred current noise. A robust photoplethysmogram readout chip was fabricated using a 0.13-μm CMOS process, consuming 26.4 μW with an input referred current noise of 260 pArms.
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