A photoplethysmogram (PPG) device can be implemented to measure blood-volume changes from which vital sign information such as blood oxygen levels and heart rates are derived. In Part 1, we provided discrete power-supply circuit design solutions for best performance using the MAX86171 optical pulse oximeter and heart-rate sensor analog front end (AFE). In Part 2, we show an integrated solution for space-constrained applications using the MAX86141 optical pulse oximeter and heart-rate sensor AFE (can be used with the MAX86171 as well).
As mentioned in Part 1, Analog Devices offers power-supply subsystem circuit designs that have been pre-validated (i.e., designed, built, and tested), ensuring the signal-to-noise ratio (SNR) performance of each biosensing AFE device.