AS7038RB Biosensor Solution with Embedded ECG Channel

AS7038RB Biosensor Solution with Embedded ECG Channel


ams’ biosensor solution is based on photoplethysmography and electrocardiogram

The operation of the ams AS7038RB is based on photoplethysmography (PPG) and electrocardiogram (ECG). PPG is the most used HRM method, which measures pulse rate by sampling light modulated by the blood vessels, which expand and contract as blood pulses through them. PPG is also used to measure blood oxygen saturation (SpO2). ECG is the reference for any measurement of the biopotential generated by the heart. Embedded ECG analog front end satisfies IEC 60601-2-47 requirements.

The solution includes LED drivers, photo-sensor, analog front-end (AFE), sequencer, and application software. In addition, the device also enables skin temperature and skin resistivity measurements by providing interfaces to external sensors.

Compare to ams’ previous generation, AS7038RB has a 250% larger photodiode with lower LEDs driving current to achieve the high PPG performances. The AS7038RB’s low-power design and small form factor are particularly well suited to application in earbuds, fitness bands, smartwatches, sports watches, and smart patches in which board space is limited and in which users look for extended, multi-day intervals between battery recharges. The thin package dimension makes the AS7038RB suitable for height constrained solution likes earbuds or smart patches. The photodiode filter centered on red and infrared wavelengths and embedded ADC make the AS7038RB suitable for disposable pulse oximeter solutions.


  • Address all skin types
  • Allows smallest application size, e.g., narrow HRM measurement band
  • ECG with dry electrodes
  • Enabling SpO2 measurements
  • Integrated optical interference filter
  • Low power: long operating time
  • Works reliably with ambient light


  • Optical sensor platforms
  • Disposable oximeters
  • Smart patches
  • Earbuds
  • Fitness bands
  • Pulse oximeters
  • ECG monitoring

Block Diagram

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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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