A 2.4-GHz Low-Power/Low-Voltage Wireless Plug-and-Play Module for EEG Applications

• Published in: IEEE sensors journal Vol. 7; no. 11; pp. 1524 - 1531
• Main Authors: Carmo, J.P., Dias, N.S., Silva, H.R., Mendes, P.M., Couto, C., Correia, J.H.
• Format: Journal Article
• Language: English
• Published: New York IEEE 2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Brain; CMOS process; Electrodes; Electroencephalography; Energy consumption; Modules; Plug-and-play module; Radio frequencies; Radio frequency; radio frequency (RF) CMOS transceiver; Radio transmitters; Silver; Sintering; Titanium nitride; Transceivers; wireless electroencephalogram (EEG); Wireless sensor networks; wireless sensors networks
• ISSN: 1530-437X; 1558-1748
• DOI: 10.1109/JSEN.2007.908238

This paper presents a plug-and-play module for wireless electroencephalogram (EEG) applications. The wireless module is composed by an electrode, processing electronics, a radio-frequency (RF) transceiver, and an associated antenna. The RF transceiver was fabricated in the UMC RF 0.18 mum CMOS process, and operates in the 2.4-GHz ISM band. The receiver has a sensitivity of -60 dBm and a power consumption of 6.3 mW from a 1.8 V supply. The transmitter delivers an output power of 0 dBm with a power consumption of 11.2 mW, for a range of 10 m. It is also presented the electrical performance and comparison between different electrodes for EEG applications, namely sputtered titanium nitride (TiN) electrodes, standard sintered silver/silver chloride (Ag/AgCl) ring electrodes and sputtered iridium oxide (IrO 2 ) electrodes. The experimental results show a better performance of the sputtered IrO 2 electrodes compared with the standard sintered Ag/AgCl ring electrodes. These results promise a new opportunity for the application of a dry IrO 2 electrodes in wireless modules for using in a wearable EEG braincap. These wireless EEG modules will allow patients to wear a brain cap and maintain their mobility, while simultaneously having their electrical brain activity monitored.