GATE 2015 EE (EE2) – Question 25

Analog and Digital Electronics · Amplifiers: biasing, equivalent circuit and frequency response · 1 mark · Multiple choice

For a BJT operating in saturation, which statement about collector–base and base–emitter junctions is true?

CB forward-biased, BE reverse-biased
CB reverse-biased, BE forward-biased
both CB and BE forward-biased
both CB and BE reverse-biased

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Show answer and explanation

Correct answer: (C) both CB and BE forward-biased

Explanation

Saturation occurs when both junctions are forward-biased. In forward active mode only BE is forward-biased while CB is reverse-biased; cut-off has neither forward-biased. Thus the defining saturation condition among these choices is **C**.

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