IEEE Trans Biomed Circuits Syst. 2019 Dec;13(6):1243-1253. doi: 10.1109/TBCAS.2019.2944393. Epub 2019 Oct 2.
Photoplethysmography (PPG) enables wearable vitals monitoring. Nevertheless, it is still limited by the few mA of the LEDs driving current. We present a PPG sensor integrating an array of dedicated pinned-photodiodes (PPD) with a full readout chain integrated in a 0.18 μm CMOS Image Sensor (CIS) process. The sensor features a total input referred noise of 0.68 e-rms per PPD, independently of the input light, and achieves a 4.6 μW total power consumption, including the 2 μW LED power, at 1.38 bpm heart rate average error.
光电容积脉搏波描记术 (PPG) 可实现可穿戴生命体征监测。然而，它仍然受到驱动电流仅有几毫安的限制。我们提出了一种 PPG 传感器，它集成了带有全读出链的专用光电二极管 (PPD) 阵列，集成在 0.18 μm CMOS 图像传感器 (CIS) 工艺中。该传感器的每个 PPD 的总输入参考噪声为 0.68 e-rms，与输入光无关，并实现了 4.6 μW 的总功耗，包括 2 μW 的 LED 功率，平均心率误差为 1.38 bpm。
