Dedicated vital sign sensor for SpO2 measurement

The small sensors are suitable for innovative applications in medical wearables and remote diagnostic equipment, such as disposable patches used for blood oxygen saturation (SpO2) and electrocardiogram (ECG) measurement.

The ams AS7038RB and AS7038GB sensors and AS7030B sensor module are based on photoplethysmography (PPG) and electrocardiogram (ECG), two popular methods for heart rate monitoring (HRM) and heart rate variability (HRV), which measure the pulse rate by sampling light modulated by blood vessels.

The AS7038RB sensor is said to be the industry's thinnest dedicated sensor for SpO2 measurement, at just 3.70 mm × 3.10 mm × 0.65 mm.

A combination of small size, integrated functionality, and a high-performance signal chain enables designers to incorporate vital monitoring capability to small consumer products such as earbuds, smart watches and wristbands, as well as to medical devices such as patches and oximeters.

An on-wafer interference filter technology developed by ams enables it to capture optical signals in the 590nm-710nm and near infrared (800nm-1050nm) wavelength bands for SpO2 measurement, while blocking interference from ambient light at other wavelengths.

The AS7038GB version features peak sensitivity at the 525nm (green) wavelength for use in heart rate (HRM) and heart rate variability (HRV) measurement, while the AS7030B HRM/HRV sensor module integrates two 535nm LEDs in a single 3.55 mm × 6.2 mm × 1 mm package.