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Which of the following component is not a part of the passive filter?

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Which of the following component is not a part of the passive filter?

(a) resistor

(b) operational amplifier

(c) capacitor

(d) inductor

This question was posed to me in exam.

The doubt is from Smart Sensors in section Physiological Transducers of Biomedical Instrumentation

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Right option is (b) operational amplifier

Explanation: Operational amplifier is not a part of passive filters. It is a part of an active filter. Passive components are resistors capacitors and inductors. Active filters use opamps in addition to passive components in order to obtain better performance.

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