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Draw the typicalinputand output characterisitics of an n-p-n transistor in CE configurtion . Showhow these characteristic can be used to determine (a) theinputresistance(r_(1)) and(b)currentamplificationfactor (beta). |
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Answer» Solution :Characteristics ofTransistorin C- E configuration: InputCharacteristics: I/P CH in C - E configuration as shown. It is thecurvebetweeninputcurrent`I_(B)`base currentand theI/P voltage `V_(BE)` (Bare Emitter voltage ) at constantcallector emitter voltage`(V_(LE))` InputResistance :`r_(i) = (DeltaV_(BE))/(DeltaI_(B))|V_(CE)`= constant DYNAMIC I/P resistance `r_(i)`is verysmall in CE configuration due to this after the cut in voltagebase CURRENT`I_(B)`increase rapidly with small increase on base-emittervolt. `V_(BE)`  Output Characteristic: Outputcharacetristic is a platebetween the collectorcurrentIC andcollector volt. `V_(CB)`usingbasecurrent`I_(B)` as constant. `B_(dc)` and `B_(ac)`: We knowthat , `B_(dc) = (I_(C))/(I_(B))` a.c Beta isobtained. `B_(ac) = (DeltaI_(C))/(DeltaI_(B))` 
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