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Large 50Hz power-line noises when recording ECG with ADS1299

Shixiong Chen
Prodigy 60 points
Other Parts Discussed in Thread: ADS1299

I used channel IN1P, IN1N, and BIAS_DRV to measure ECG using ADS1299 evaluation board. I had set SRB1 and SRB2 to OFF, and included only channel 1 for bias generation. But there were large amplitude of 50Hz noises and its harmonics (like 150Hz, 250Hz, etc), which was so large that it was impossible to observe the ECG signal. I did use the RLD to reject the common mode using the bias_DRV signal, but it seemed not working. Any suggestions? Thanks in advance.

  • 0
    TI__Mastermind 38745 points
    Hey Shixiong,

    Unfortunately the bias drive really only works well for signals which are truly common-mode. If the interference is differential at the inputs then the device will convert it. Some folks deal with this issue by constricting their own digital notch filter that runs on the samples following collection.

    Regards,
    Brian Pisani