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ADS1299EEGFE-PDK: Predominance of 50 Hz signal during EEG acquisition, even while powering the board using batteries.

Dhadma Balachandran
Prodigy 10 points
Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299

Hello,

We wanted to acquire EEG signal using ADS1299. So, we got the Evaluation module to decide on the register values before using the chip. But the 50 Hz signal seems to obscure the actual EEG acquired. 

We also tried powering the board with battery and found that the noise still persists. Change in gain of PGA also doesn't show any significant change in the signal amplitude.

We have used Channel 1 to provide differential input. A bias electrode has also been used. Attached is the screenshot of the signal obtained and the Register file saved.The signal shown was acquired at rate of 250 samples per seconith Gain of 24.

It would be very helpful if you could tell us how to overcome this problem.

Thank you

  • 0
    TI__Guru 66466 points

    Hello Dhadma,

    Welcome to our forum and thank you for you post!

    50 Hz and 60 Hz power line is a common problem in biopotential applications. Noise can couple in from your power source or from the ambient lighting. Care must be taken to properly shield the system and preserve common-mode rejection in the signal path.

    Please review some of the following material:

    Best Regards,