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Which parameter of the physical model is varied while measuring the output characteristics of a CB short circuit current frequency response?

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Which parameter of the physical model is varied while measuring the output characteristics of a CB short circuit current frequency response?

(a) Emitter current

(b) Emitter voltage

(c) Collector current

(d) Collector base voltage

I had been asked this question in exam.

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

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Correct answer is (d) Collector base voltage

Explanation: To determine the output characteristics, the emitter current is kept constant at zero and the collector base voltage is increased from zero volts to varying voltage levels. For each voltage level of the output voltage, the collector current is recorded.

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