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For the BJT to operate in active mode Collector-Base junction must be

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For the BJT to operate in active mode Collector-Base junction must be

(a) Heavily doped

(b) Must reversed bias

(c) Must be forward bias

(d) Lightly doped

I have been asked this question during a job interview.

My question is taken from BJTs Current-Voltage Characteristics in chapter Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

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Correct option is (b) Must reversed bias

The explanation: The BJT operates in active mode when the collector-Base junction is reversed bias. Also doping cannot prevent saturation of the transistor.

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