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What is the advantage of using a cascading transistor configuration?

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What is the advantage of using a cascading transistor configuration?

(a) High gain and high bandwidth

(b) High gain and low bandwidth

(c) Low gain and high bandwidth

(d) Low gain and low bandwidth

I have been asked this question during an interview.

This intriguing question originated from The Cascode Transistor Configuration in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct option is (a) High gain and high bandwidth

Easy explanation: A circuit having a single transistor configuration does not provide suitable bandwidth or gain. To overcome this difficulty, we combine several amplification stages. The cascading transistor configuration theory is used for high gain as well as high bandwidth.

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