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What are generally designed to have a very high value of input impedance to take care of high electrode impedance?

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in Biomedical Instrumentation by (76.6k points)
What are generally designed to have a very high value of input impedance to take care of high electrode impedance?

(a) Montages

(b) Electrodes

(c) Preamplifiers

(d) Filters

The question was posed to me by my college director while I was bunking the class.

My question is from Measurement of Heart Rate topic in section Patient Monitoring System of Biomedical Instrumentation

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The correct choice is (c) Preamplifiers

Easy explanation: Good electrode impedance should be generally below 5 kilohms. Impedance between a pair of electrodes must also be balanced or the difference between them should be less than 2 kilohms. EEG preamplifiers are generally designed to have a very high value of input impedance to take care of high electrode impedance.

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