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The coupling device is essential for a difference amplifier.

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The coupling device is essential for a difference amplifier.

(a) True

(b) False

This question was posed to me in an online interview.

The origin of the question is Transistor Difference Amplifiers topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct option is (a) True

Explanation: One of the main functions of the coupling device in a difference amplifier is to block the direct current from passing through to the input of next stage from the output of the first stage. Another function of the coupling device is to transfer the current from the output of first stage to the input of the second stage.

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