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The Collector feedback helps to evade __________

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The Collector feedback helps to evade __________

(a) Inverse Active mode

(b) Pinch Off

(c) Thermal Runaway

(d) Breakdown

The question was posed to me in an interview for internship.

This question is from Collector Feedback Configuration topic in section Transistor Biasing and Low Frequencies of Analog Circuits

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Best answer
Correct option is (c) Thermal Runaway

Best explanation: The increase in the Collector current is primarily due to ICO. A sudden increase in ICO can increase the Collector current and this will increase the temperature of the device. This is called thermal runaway and due to the high current gain of the transistor, the transistor can get destroyed due to thermal runaway. The Collector feedback configuration helps to evade this phenomenon.

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