Hello Vojin!
Okay, to sum up:
The reference Signal is fed to all negative inputs of the channels 1-8, and the sensing EEG electrodes to the positive.
The Bias Signal is generated by using the internal (or external) bias reference with setting register BIASREF_INT=1 (BIASREF_INT=0) and compare it with the internal BIAS_AMP with the electrode DC signals of all inputs (positive and negative). The signal from th input is routed to the BIAS_AMP by setting the register entries BIAS_SENS[x]=1. The output of the amplifier BIASOUT should then be connected with the bias electrode that is used to set the patient to a defined potential.
IS that correct or did i miss something.
But what is the RC part of 1 MOhm and 1.5 nF in Figure 46 of page 48 int he ADS1299 datasheet for?
Regards Melanie