Key result
A low-power PPG front end achieved up to 100 μA of static interferer current removal and 87 dB attenuation of time-varying interferers while consuming 425 μW.
The developed PPG SoC demonstrates efficient static and time-varying interferer removal with low power consumption, which may be useful for wearable cardiovascular monitoring devices.
Supports interferer-robust low-power PPG hardware development; leaves open clinical validation for cardiovascular monitoring.
This paper presents a low-power, reflectance-mode photoplethysmogram (PPG) front end with up to 100 μA of static interferer current removal and 87 dB attenuation of time-varying interferers. The chip nominally consumes 425 μW including signal chain circuits, red and IR LED drive power, clocks, digitization and I/O. Measured data shows the noise of the PPG signal to be dominated by the photodiode sensor photon shot noise.
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Winokur et al. (2014) studied this question. Low-power, reflectance-mode photoplethysmogram (PPG) front end was evaluated on Interferer current removal and power consumption. A low-power PPG front end achieved up to 100 μA of static interferer current removal and 87 dB attenuation of time-varying interferers while consuming 425 μW.
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