Hello everyone,
I'm trying to design a circuit for EEG signals measuring with ADS1299, what I want is trying to get the most qualified signal with ADS1299 that working in single-ended mode. The datasheet of ADS1299 provide a typical design of single-ended mode, as shown bellow. It seems that this use the dedicated reference electrode and bias electrode, exactly match our requirement！
- First question：Is the signal connection looks like bellow if I adopt this typical design? (the SRB represent the reference electrode). What's more, where the SRB and BIAS should place in the head? To my understand, the SRB (reference) should place on the central top of head, and the BIAS might connect to the ears. Does this understand right?
(from openBCI project)
- second question ：How to deal with the BIASIN in above design? (the example schematic in Figure 73 has not mentioned the BIASIN) It's OK to leave the BIASIN suspended or preferably to connected to a signal? if its preferably to connected to a signal, which signal should it connect to? (we use a bipolar supply in our design that similar to the recommendation of datasheet). According to my understanding of the EEG Front-End Performance Demonstration Kit, it should be like this, (routing the external bias signal BIAS_ELEC to BIASIN), is this understanding right?
