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ADS1298: The ECG plot get from human is always more noisy than discrete solution

John11513
Expert 5720 points
Part Number: ADS1298


Hi,

My customer reported that they found the ECG plot got by ADS1298 from human is always seems more noisy than discrete solution. Though the noise performance of the equipment based on ADS1298 is good when testing with test instrumenbts. However, the noise performance of ADS1298 solution seems significantly worse than discrete solution when test with human boardy, see blow ECG plot got from human boardy with ADS1298 (blue plot) and discrete solution (red) respectively. The two plots were processed by same software filter (50Hz nortch and 100Hz LPF). What is the root cause do you think?

Thank you,

John

  • 0
    TI__Guru**** 181511 points
    Hi John,

    It's hard to determine what might be causing the differences without having significantly more detail about how the analog signal is being captured. If you care to send detail offline (schematics of the two solutions, filter details on the front end, etc.) we'd be happy to provide some feedback.
  • 0 in reply to Tom Hendrick
    TI__Guru 66716 points
    Hi John,

    Thanks for sending this to us.

    Are these two waveforms captured simultaneously? I honestly don't see much difference at all, they are very similar.

    The best way to characterize the noise performance of each solution is to short the electrode inputs together and tie them to mid-supply. Then capture a set of data and analyze the peak-to-peak and RMS noise of each solution for comparison.

    The difference in noise performance could be related to component selection or layout, or both. If you send the schematic and layout files to Tom or myself, we will gladly review them and provide some recommendations.

    Best Regards,