Because of the bandgap narrowing, the emitter injection efficiency and the current gain both decrease.( )
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To avoid the current crowding effect, powder transistors are usually designed with narrow emitter widths and fabricated with an interdigitated design.( )
The bipolar transistor has three separately doped regions and two pn junctions. The three terminal connections are called the ______ , ______ , and ______ .
The description ( ) is not right for the basic principles and equations of npn transitor.
A. the injection of electrons from the n-type emitter and the collection of the electrons in the collector
B. the width of the base needs to be small compared with the minority carrier diffusion length, so the junctions are close enough to be called interacting pn junctions
C. the electrons injected from the emitter will diffuse across the base region into the B-C space charge region at the forward-active operating mode
D. Both the B-E junction and the B-C junction are forward biased at the forward-active operating mode
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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