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AFE4403's output PPG is different from normal.

CY Hahm
Prodigy 40 points
Other Parts Discussed in Thread: AFE4403EVM, AFE4403

Hi, all.

I've checked the output of the AFE4403EVM which is different from the normal PPG's shape.

As you well know, the PPG's signal come from the heartbeat, the systole and diastole of heart.

And so the normal PPG's shape is below like( It's a period). 

But the output of AFE4403EVM is below, probably inversed PPG.

How can I interpret this figure.

 

Although I've checked the this community's question "AFE4403 waveform's shape is different" at Feb 19, 2016 4:12AM,

 but the reply's link is no longer exist.

Would you explain this situation detailed?

Thanks in advanced.

Sincerely yours.