Hi everyone,
I'm currently working on my bachelor's thesis about commercial ECG devices, and I'm focusing on the analog front-end architecture – from the electrodes up to the ADC stage.

I'm looking for block diagrams or architecture references for the following types of devices:

• Smartwatches with ECG capabilities
• Chest strap monitors ( for example Polar H10)
• Portable handheld ECG monitors ( for example KardiaMobile)

Ideally, I would like to see:

• The signal path: from electrodes → protection → amplification → filtering → ADC
• Any use of right-leg drive, lead-off detection, or common filtering strategies
• Whether there’s a known chip used in such devices

If anyone has block diagrams, whitepapers, or technical teardowns, it would be extremely helpful.
Thanks in advance for any pointers or suggestions!

 

I think you have to search on researchgear, academia, etc. Did you try?

 

Not sure if these will help:

Wireless Non-contact EEG/ECG Electrodes for Body Sensor Networks
Yu M. Chi and Gert Cauwenberghs
University of California, San Diego
La Jolla, CA 92093
www.isn.ucsd.edu/papers/bsn10.pdf

http://cognionics.com/

google: remote detection of human electrophysiological signals using electric potential sensors

http://usb.issc.ie/download/file/164.pdf
-> New displacement current sensor for Remote Recording of Human Biopotentials 2011 - Lorenzo Faggion, Abdulhussain E Mahdi.pdf

distance from person sitting in chair, levels, circuit diag w/ 2 opamps

https://www.mdpi.com/1424-8220/14/8/14732/pdf ->
Flexible Capacitive Electrodes for Minimizing Motion Artifacts in Ambulatory Electrocardiograms 2014 sensors-14-14732.pdf