MEEPS
Mohsen Mollazadeh
Mixed Signal VLSI Systems
Prof. Cauwenberghs
EEG Recording
 Why?
Slow waves (application : BCI)
Broca’s Area(audiotory Cortex)
Eplilepsy
System Design
 4 Channel EEG Recorder
 Low Noise Amplifier
 Digitized output (NRZ and Miller)
 Fully Differential Pathway
OpAmp
OpAmp
High Resistance Generation
OP Amp Results
OpAmp Results
Corner Frequency : 100 Hz
Thermal Noise level: 25 nV/sqrt(Hz)
OpAmop Results
 Gain : 40 db
 Power Consumption : 60 uW
 Input Referred Noise : 4.5 uVrms
 Bandwidth: .8 – 10 KHz
 Resistance Achieved: >5Tohms
OpAmp Layout
Delta Sigma AtoD
Delta Sigma results
EEG Channel
Future Directions
 Complete this and send the chip!!!
 Integration with Telemetry System
 FIEEP (A Fully Implantable elctroElectrochemical Probe)Inductor Coil
SIC Chip
Potentiostat
SoS released
probe body
Electrodes
Acknowledgements
 Thanks to:
Prof. Cauwenberghs
Kartik, Chris, Yunbin, Abdullah and Milutin