Publication
Photoplethysmography (PPG) enables wearable vitals monitoring. Nevertheless, it is still limited by the LEDs driving current in the range of mA. We present a PPG sensor integrating an array of dedicated pinned-photodiodes (PPD) with the full readout chain in 180 nm CIS process. The sensor features a total input referred noise of 0.68 e-RMS per PPD, independently of the input light, and achieves 4.7 µW total power consumption, including 2 µW LED power, at 1.38 bpm heart rate average error.
David Atienza Alonso, Tomas Teijeiro Campo, Lara Orlandic, Jérôme Paul Rémy Thevenot
Mihai Adrian Ionescu, Teodor Rosca