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To achieve the low frequency response for medical applications, the amplifier configuration must contain?(a) higher resistance(b) higher capacitance(c) lower resistance(d) lower capacitanceThis question was posed to me in an interview.This is a very interesting question from Smart Sensors in chapter Physiological Transducers of Biomedical Instrumentation

Answer»

Correct option is (b) higher capacitance

Explanation: To achieve the low FREQUENCY RESPONSE required for MEDICAL applications, the amplifier must have LARGE VALUES of coupling capacitance. In all RC-coupled amplifiers, low frequency response is limited by the reluctance of the coupling capacitors. The response should be down to less than one hertz which is a very frequent requirement.



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