MEEPS

Mohsen Mollazadeh

Mixed Signal VLSI SystemsProf. 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 elctro-

Electrochemical Probe)

Potentiostat

SIC Chip

Inductor Coil

Electrodes

SoS released probe body

Potentiostat

SIC Chip

Inductor Coil

Electrodes

SoS released probe body

Acknowledgements

Thanks to:

Prof. Cauwenberghs

Kartik, Chris, Yunbin, Abdullah and Milutin