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PPG 센서 수신기용 Switched Capacitor를 활용한 Transimpedance Amplifier 회로
강상진(Sangjin Kang),김솔지(Solji Kim),김선국(Sunkook Kim),이성호(Sungho Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
One of the main challenges for PPG (Phtoplethysmography) sensors is eliminating ambient light signal for improved signal quality. The PPG sensors are so popular in wearable applications that they should be small and low power consumption. In this paper, we propose a Transimpedance Amplifier (TIA) using Switched Capacitor (SC) technique. By adding SC, we achieve 20∼35.5dB gain signal compared to ambient light signal and 28 W low power consumption in 1.75×1.75 mm2 chip size.