Title :
A Low-Power, Dual-Wavelength Photoplethysmogram (PPG) SoC With Static and Time-Varying Interferer Removal
Author :
Winokur, Eric S. ; O´Dwyer, Tom ; Sodini, Charles G.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
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.
Keywords :
photodiodes; photoplethysmography; shot noise; PPG SoC; dual wavelength photoplethysmogram; low power photoplethysmogram; photodiode sensor; photon shot noise; signal chain circuits; static interferer current removal; time varying interferer removal; Dynamic range; Harmonic analysis; Light emitting diodes; Noise; Photodiodes; Power harmonic filters; System-on-chip; Interferer; low-power; mixed-signal; photoplethysmogram (PPG); wearable devices;
Journal_Title :
Biomedical Circuits and Systems, IEEE Transactions on
DOI :
10.1109/TBCAS.2014.2358673
