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Neural Recording System
By: Ivana Duvnjak Stephen Kilpatrick Dawit Fsiha
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Outline What is a Neural Network Recording System?
Why are they important? How can they be improved? Some possible solutions Analysis of some solutions Conclusions
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Neural Network Recoding Systems
Brain sends electrical signals - Neurons Sent through axons Electrical Signals processed by synapses Mapping the brain
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Applications Medical Research Mental Performance Mental Illness
Sleep Disorders Etc.
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Subsystems Electrode Amplifier Multiplexer Transmitter Receiver
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Block Diagram of System
Electrode Amplifier Tx Rx DATA POWER MUX
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Possible Improvements
Areas to improve in the neural recording system Electrodes Amplifier Multiplexer Transmitter Receiver
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Neural LNA Amplifier Functions Power dissipation must kept low
Must reject noise ( flicker noise) Amplifying a weak signal received from the electrodes Must reject the DC offset created at the electrodes-Tissue interface
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Neural Amplifier Requirements
Power dissipation Bandwidth requirement Gain Stability Overall size
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Amplifier Solutions: Design I
Neural Amplifier Circuit OTA Design
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Amplifier Solutions: Design II
Neural Amplifier Circuit OTA Design
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Design I: Simulation Results
10 pW power consumption 39.974dB gain Low-cutoff frequency: 0.4Hz High-cutoff frequency: 7.852kHz Area: 0.16mm2 Stable
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Design II: Simulation Results
11.5 pW power consumption 40.362dB gain Low-cutoff frequency: Hz High-cutoff frequency: kHz Area: 0.091mm2 Stable
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High-frequency cutoff
Comparison of Designs Table 1. Summary of simulation results for the neural amplifiers Parameter Expected Circuit 1 Simulation Circuit 2 Simulation Supply voltage +/-2.5V +/-1.5V Power dissipated <5mW 10pW 11.5pW Gain 40dB 39.974dB 40.362dB Bandwidth ~7.0kHz ~7.852kHz ~32.443kHz Low-frequency cutoff 0.025Hz 0.4Hz 83.144Hz High-frequency cutoff 7.0kHz 7.852kHz 32.526kHz
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Conclusions Both designs meet the requirements of:
Power consumption Stability Size DC offset rejection Design I is significantly better, due to the more desirable bandwidth requirements.
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Implementation
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References
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Exit(0); Questions?
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