Discussion
Why does a transistor's beta fall at high frequencies?
Answer: A
At high frequencies the base-emitter capacitance takes an increasing share of the drive current, so less of it produces collector current. Base thickness is fixed, leakage is a temperature effect, and the Early effect is a voltage effect. A gain that falls with frequency is nearly always a capacitance diverting something, and finding which capacitance and where it goes is the whole of high-frequency analysis.
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