PPG and SpO2 Recording Circuit with Ambient Light Cancellation for Trans-Nail Pulse-Wave Monitoring System. - Ryosuke Yabuki; Tetsu Tanaka; Zhengyang Qian; Kar Mun Lee; Bang Du; Filipe Alves Satake; Tasuku Fukushima; Hisashi Kino; Takafumi Fukushima; Koji Kiyoyama (BioCAS, 2019)