A 0.5V <4µW CMOS photoplethysmographic heart-rate sensor IC based on a non-uniform quantizer. - Mohammad Alhawari; Nadya Albelooshi; Michael H. Perrott (ISSCC, 2013)

A 0.5 V < 4 µW CMOS Light-to-Digital Converter Based on a Nonuniform Quantizer for a Photoplethysmographic Heart-Rate Sensor. - Mohammad Alhawari; Nadya Albelooshi; Michael H. Perrott (IEEE J. Solid State Circuits, 2014)