Forward and reverse-active in bipolar junction transistor, Electrical Engineering

Forward and Reverse-active in Bipolar Junction Transistor:

Forward-active (or simply, active):

The base-collector junction is reverse biased and base-emitter junction is forward biased. Several bipolar transistors are planned to afford the greatest common-emitter current gain, βF, in forward-active mode. If this is the case, the collector-emitter current is almost proportional to the base current, however many times larger, for small base current variations.

Reverse-active (or inverse-active or inverted):

By reversing the biasing situations of the forward-active region, a bipolar transistor departs into reverse-active mode. In this form, the emitter and collector regions switch roles. Since most BJTs are planned to maximize current gain in forward-active mode, the βF in inverted mode is many (2-3 for the ordinary germanium transistor) times smaller. This transistor mode is used rarely, generally being considered only for failsafe conditions and some sorts of bipolar logic. To the base reverse bias breakdown voltage might be an order of magnitude lower in this type of region.

Posted Date: 1/10/2013 6:44:47 AM | Location : United States







Related Discussions:- Forward and reverse-active in bipolar junction transistor, Assignment Help, Ask Question on Forward and reverse-active in bipolar junction transistor, Get Answer, Expert's Help, Forward and reverse-active in bipolar junction transistor Discussions

Write discussion on Forward and reverse-active in bipolar junction transistor
Your posts are moderated
Related Questions

Speed  Control of Three  Phase Induction Motors Three  phase  induction motors are invariably used in the application where in speed in  required to be  constant  or adjustabl

short notes on thermal runaway

Q. Explain about Common Control Switching System? Common Control Switching System: A functional block diagram of a common control switching system is displayed in Figure. Contr


Q. Determine the Laplace transform for each of the following functions from the basic de?nition of Equation. (a) f 1 (t) = u(t) (b) f 2 (t) = e-at (c) f 3 (t) = df (t) dt,

Q. A particular BJT has a nominal value of α 0.99. Calculate the nominal β.If α can easily change ±1%, compute the percentage changes that can occur in β.

DC Motor Starting When voltage is applied to the armature of a dcmotorwith the rotor stationary, no emf is generated and the armature current is limited only by the internal ar

Explain the Discrete Time Systems? A system operates on an input signal, x[n] and output the results, y[n]. For example, a digital filter (a system) can be represented by the f

Normal 0 false false false EN-IN X-NONE X-NONE Life   Interactive UPS Systems