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What is the path of the output characteristic of a CB transistor physical model in the saturation region?

(a) Linear

(b) Exponential decrease

(c) Exponential increase

(d) Constant

The question was asked in an international level competition.

Query is from Physical Model of a CB Transistor topic in portion Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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The correct option is (c) Exponential increase

To explain I would say: In a physical model of a common base transistor, the output characteristic curve first increases exponentially and then remains constant. In the saturation region of working the output characteristics show an exponential increase in the collector current with respect to collector base voltage.

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