ABRET R.EEG.T Study Guide - EEG Instrumentation Questions With Complete Solution 2025 A+ Grade What is the definition of a differential amplifier? - ANS-Amplifies only the difference in voltage between two inputs. Does not amplify equal voltages at two inputs. The more the inputs are different the more there is to amplify. What is the definition of Input Impedance? - ANS-NOT the impedance between the scalp and the electrodes An impedance between components of the differential amplifier. It must be HIGH for optimal functioning of the amplifier. Must be at lease 10 mega ohms What is the definition of of common mode rejection? - ANS-A metric used to quantify the ability of the device to reject common-mode signals, i.e. those that appear simultaneously and in-phase on both inputs. Rejects external interference such as 60 Hz and radio frequencies by canceling signals common to both inputs. The CMRR should be at least 80dB or 10,000:1 The rule in the design of EEG instruments is that if input 1 is positive with respect to input 2 the deflection of the channel will be? - ANS-Down The rule in the design of EEG instruments is that if input 1 is negative with respect to input 2 the deflection of the channel will be? - ANS-Up What is the definition of gain? - ANS-
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