In addition, achieving high accuracy in the measurements has also been challenging, particularly in cases where sensor sensitivity might be impacted by low perfusion levels or dry skin. The MAX86150 ...

The MAX86150 overcomes these challenges, sampling both PPG and ECG simultaneously to provide the highest sensitivity of pulse transit time.

“Unlike existing optical analogue front-ends which produce raw PPG readings, AS7000 integrates a digital processor which converts PPG readings into digital heart rate and heart rate variation”, ...

The most common wearable heart-rate sensors use an optical technique called photoplethysmography (PPG), which estimates artery volume using light. A wearable PPG sensor emits light onto the skin.