A Wireless System for Biopotential Acquisition: an Approach for non-Invasive Brain-Computer Interface

Brain-computer interfaces (BCI) promise to be a very important tool for the handicapped people in the near future. A wireless biopotential acquisition system is proposed as a solution for true mobility during non-invasive BCI operation. Special care about noise must be taken in a signal acquisition system for biopotentials. The EEG signal amplitude ranges from a few to dozens of micro-volts and it is very low compared with the interference from mains power. Thus, a good quality signal requires an efficient interference removal. The wireless system is operating at 2.4 GHz, the maximum data throughput is 120 Kbps, the system resolution is about 4 muV, the power consumption is 0.015 W and accommodates 5 single-ended channels. The dimensions of the wireless acquisition system are approximately 5.7times4.8times2.0 cm³.