Discussion
Why is the hybrid-pi model inadequate above the transition frequency?
Answer: D
Above the transition frequency the device provides no current gain at all, so it cannot amplify and the model describes something that no longer behaves as an amplifier. The transconductance does not reverse sign, measurement difficulty is not a model failure, and the device stays biased in the active region. A model breaking down at the point where the device stops doing its job is not a coincidence, since both follow from the same capacitances.
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