题目内容

Three equivalent circuit models for a bipolar transistor are ___________.

A. Kirchoff Model
B. E-M(Ebers-Moll) Model
C. G-P(Gummel-Poon) Model
D. H-P(Hybrid-Pi) Model

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The bipolar transistor is a transit-time device. As the frequency increases, this transit time can become comparable to the period of the input signal. ()

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