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AFE4490SPO2EVM: Sinewave ambient noise

Yee Ling Chan
Prodigy 10 points
Part Number: AFE4490SPO2EVM

Deal all,

I measured PPG signals but they tend to follow sinewave. I used PRF of 100 Hz and current of 1.76 mA. I would like to know the reason of signals drifted. Thank you.

  • 0
    TI__Genius 12575 points
    Hi Yee,

    Since the sine wave is present even in the ambient phases, I strongly believe that is the due to the ambient light. I would suggest to try to cover the sensor properly to block the ambient light or it can be removed in MCU by passing it through HPF.

    Regards,
    Prabin