A DEVICE FOR READ-OUT OF A PHOTOPLETHYSMOGRAPHY SIGNAL AND A WEARABLE SENSOR

摘要

A device for read-out of a photoplethysmography (PPG) signal comprises: a photodiode (106), which is configured to detect a PPG signal, the photodiode (106) comprising a first and a second terminal (114; 116); and a read-out circuitry (110; 210) for reading out the PPG signal, wherein an input stage (112) is connected to receive a first and a second input signal from the terminals (114, 116), and a DC bias voltage, and wherein the input stage (112) is configured for current sensing to provide a fully differential amplification of the input signals to a first and a second current signal, and wherein an output stage (134; 234) is configured to receive the current signals, wherein the current signals comprise an AC and a DC component of the PPG signal, and wherein the output stage (134; 234) is configured to generate a differential output voltage through a gain component (136).