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Biosensors, Volume 9, Issue 3 (September 2019)
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Cover Story (view full-size image) This research aims to minimize the power consumption of the organic optoelectronic pulse meter [...] Read more. This research aims to minimize the power consumption of the organic optoelectronic pulse meter biosensor for long-term monitoring of the PPG waveforms wirelessly. A reflectance-type optoelectronic pulse meter composed of a red organic light-emitting diode (OLED) and an organic photodiode (OPD) fabricated monolithically on a glass substrate was proposed to measure the PPG signals. Two design structures with different OLED areas and gaps between an OLED and an OPD were examined for minimizing the power consumption and noise level of the biosensor pulse meter and evaluated using the PPG signal, which was successfully collected from a fingertip. The proposed reflectance-based organic pulse meter was operated successfully with an ultra-low power consumption down to 8 μW at 18 dB SNR, and with a clear PPG signal up to 46 dB SNR at a constant current of 93.6 μA. View this paper.