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Which of the following is an advantage of RC coupling scheme?

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Which of the following is an advantage of RC coupling scheme?

(a) Good impedance matching

(b) Economy

(c) High efficiency

(d) Frequency response

This question was addressed to me during an interview for a job.

I need to ask this question from Multistage Amplifier topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right option is (b) Economy

For explanation: It uses the resistor and capacitor which are not expensive so the cost is low. But it has poor impedance matching because its output impedance is several times larger than the device; at its terminal end. It is unsuitable for low frequency application.

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