The Implementation of Communication Hub for EEG Active Electrodes

In order to minimize electromagnetic interferences in Electroencephalogram - EEG, we are developing an integrated circuit containing the amplifier, filter and AD converter to be placed directly over the electrodes, thus obtaining active electrodes. The active electrodes are connected to a hub that sends the data to the external equipment. Since the amplification and filtering should be programmable according to the patient and environment, the communication between the active electrodes and the external equipment (via hub) must be bidirectional. This paper describes the hub and its communication to the active electrodes using the I2C Protocol. The project was developed using the Verilog and tested on boards that emulated the hub and the active electrodes. The tests demonstrated the circuits work as expected.