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What is the path of the output characteristic of a CB short circuit current frequency response in the active region?

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What is the path of the output characteristic of a CB short circuit current frequency response in the active region?

(a) Linear

(b) Exponential decrease

(c) Exponential increase

(d) Constant

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Query is from The CB Short Circuit Current Frequency Response in portion High Frequency Transistor of Electronic Devices & Circuits

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Right option is (d) Constant

The explanation is: In a CB short circuit current frequency response model, the output characteristic curve first increases exponentially and then remains constant. In the active region of working the output characteristics show a constant value collector current with respect to collector base voltage.

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