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EEG Instrumentation

practice for EEG registry

QuestionAnswer
Define differential amplifier. A differential amplifier amplifies only the difference in voltage between the two inputs. It does not amplify equal (common) voltages at the two inputs. The more the inputs vary in voltage the more there is to amplify.
Define input impedance. Input impedance is impedance between components of the differential amplifier. It must be high for optimal functioning of the amplifier. Must be a least 10 mega-ohms.
Describe the polarity convention of an EEG instrument. INPUTS UP rules Down Rules input 1 negative positive Input 2 positive negative
The rule in the design of EEG instruments is that if input 1 is positive with respect to input 2, the deflection of that channel will be down
Define amplifier a combination of electric components designed to increase voltage.
Define sensitivity a measure of how much voltage is required to cause a deflection of a certain distance; in EEG usually uV/mm equation S=V/A S = sensitivity V= voltage A=Amplitude
The rule in the design of EEG instruments is that if input 1 is negative with respect to input 2, the deflection of that channel will be UP
Define gain. The ratio of output to input signal. Gain has no units of measurement.
Define time constant. The time required for the waveform to fall to 37% of the peak deflection. Describes the effect of the low frequency filter on square wave pulse.
Define common mode rejection(CMRR) Common mode rejection ratio (CMRR) is set by the EEEEG CMRR compares what is common to the amplifiers (for example 60 Hz) to what is amplified and should be a least 10,000
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