MEEPS

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MEEPS

• Mohsen Mollazadeh
• Mixed Signal VLSI Systems
• Prof. Cauwenberghs

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EEG Recording

• Why?
• Slow waves (application BCI)
• Brocas Area(audiotory Cortex)
• Eplilepsy

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System Design

• 4 Channel EEG Recorder
• Low Noise Amplifier
• Digitized output (NRZ and Miller)
• Fully Differential Pathway

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OpAmp
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OpAmp
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High Resistance Generation
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OP Amp Results
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OpAmp Results
Corner Frequency 100 Hz Thermal Noise level
25 nV/sqrt(Hz)
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OpAmop Results

• Gain 40 db
• Power Consumption 60 uW
• Input Referred Noise 4.5 uVrms
• Bandwidth .8 10 KHz
• Resistance Achieved gt5Tohms

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OpAmp Layout
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Delta Sigma AtoD
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Delta Sigma results
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EEG Channel
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Future Directions

• Complete this and send the chip!!!
• Integration with Telemetry System
• FIEEP (A Fully Implantable elctro-Electrochemical
  Probe)

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Acknowledgements

• Thanks to
• Prof. Cauwenberghs
• Kartik, Chris, Yunbin, Abdullah and Milutin