I'm using the AFE4403EVM along with the TI GUI to get PPG signal from my finger. For the Rx configuration, I use DAC cancellation current of 0.
I see a plausible signal in the LED1 and LED2 channels.
I expect to have small positive values in the Ambient channel that do not change after increasing first stage gain (i.e. Rf)
However, I see negative values AND the values increase after increasing the Rf.
Could you please explain how could that happen? It seems not logical.
Best