Electronics: Basic to clinical Karl E Misulis MD,PhD.

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Presentation transcript:

Electronics: Basic to clinical Karl E Misulis MD,PhD

Basic Electronics for Neurology Electricity and basic circuit theory Filters and amplifiers Digital signal analysis Displays Electrodes Artifacts and noise Electrical safety

Frequency composition of signals

RC Circuit

RC circuit

Time constant

Semiconductors Construction Function of semiconductors “semi-conduct” Junction effects Use in diodes and transistors

Semiconductors

Diodes

Transistor Transfer - resistor Nobel prize for Bell labs

Transistors

Amplifiers

Single v. differential amplifier

EEG amplifier - LB montage

Analog and digital systems

Analog-to-digital conversion

Binary encoding 2 12 = 4096

Averaging: Signal-to-noise ratio

Artifact rejection

Aliasing

Electrode - amplifier interface

Electrode theory

Minimize noise Equal electrode impedances Short leads Avoid proximity of AC and leads

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