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ADS1299: EEG signal common-mode noise rejection testing techniques and best practices

John VanLaanen
Prodigy 10 points
Part Number: ADS1299

Hello - we're assisting a customer who is using the ADS1299 for a EEG signal processing product application. Because of the physical attributes of their product, we are particularly concerned with common-mode noise pickup. We are interested in any help we can get in this regard, including recommendations of testing techniques for evaluating different physical design approaches. Are there any publications covering best practices for both design and test with regard to common-mode noise rejection and EEG signals? Our own research so far has produced some useful references for ECG signals, but none for EEG signals.

Thanks for any assistance you can provide!

  • 0
    TI__Guru 66186 points

    Hello John,

    Thank you for your post and welcome to our forum!

    Most of what you've found related to ECG applications should also apply to EEG applications as well. In fact, the nature of common-mode to differential noise coupling is a system challenge that applies to many applications.

    Both ECG and EEG applications place a tight restriction on signal chain component tolerances in order to match the input impedance of positive and negative inputs as closely as possible. In addition, both applications often use a "driven right-leg" electrode of sorts. In EEG, this is commonly referred to as the BIAS electrode. 

    We have some collateral related to this topic on our ADS129x BIOFAQ page on E2E. Here, we're continually adding links and FAQ posts to help with common questions around these applications. Have a look!

    Best regards,