题目内容

The description ( ) is not right for the Equivalent Circuit Models used to analyze a transistor circuit.

A. E-M (Ebers-Moll) model is used in switching applications
B. G-P (Gummel-Poon) model is used for nonuniform doping concentration in the base and emitter
C. Amplification usually involves superimposing sinusoidal signals on dc values and turning a transistor from its “off” state to forward-active.
D. H-P (Hybrid-Pi) model is used in amplification applications

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The total emitter-to-collector time constant or delay time is composed of several separate time constants, including ( ).

A. emitter–base junction capacitance charging time
B. base transit time
C. collector depletion region transit time
D. collector capacitance charging time

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The ratio of collector current to emitter current and the ratio of collector current to base current both are constant for an npn bipolar transistor biased in the forward-active mode.( )

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Considering the base width modulation, the base width is a function of the B-C voltage. As the B-C reverse-biased voltage increases, the B-C space charge region width increases, which increases the base width.( )

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The common-emitter current gain decreases with high injection.( )

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