Cheat Sheet 332 (3)
1
i C =α F i E i C =i S [ exp ( V BE V T ) −1] β F = α F 1−α F i C =β F i B i B = i S β F [ exp ( V BE V T ) −1 ] α F = β F β F +1 i E =( β ¿¿ F+1 ) i B ¿ i E = i S α F [ exp ( V BE V T ) −1 ] i E =i B +i C exp ( V BE V T ) ≫ 1 ∴ exp ( V BE V T ) −1=¿ exp ( V BE V T ) General NPN BJT Mode Condition Behavior Cutoff V BE <0 V BC <0 i C =i E =i B =0 V BE <0.5 V V BC <0.4 V Active V BE >0 V BC <0 V BE =0.7 V CE >0.3 saturatio n V BE >0 V BC >0 V BE =0.7 V V CE sat =0.2 V i C i B =β Forced Common Emitter NPN BJT Mode Condition Behavior Cutoff V ¿ <V BE on V BE = V ¿ i B =0 i C =0 V CE = V CC Active V ¿ >V BE on V CE >V CE sat V BE = V BE on i B = V ¿ − V BE on R B i C =βi B V CE = V CC −i C R C Saturat ion V ¿ >V BE on V CE <V CE sat V CE = V CE sat ≅ 0.2 V i B = V ¿ − V BE on R B i C = V CC −V CE sat R C V BE = V BE on Mode EBJ CBJ Acting Cutoff Rev Bias Rev Bias Open sw. Active Fwd Bias Rev Bias Good amp. Saturat ion Fwd Bias Fwd Bias Closed sw. Rev. Active Rev Bias Fwd Bias Poor amp.
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Equations sheet
Transcript of Cheat Sheet 332 (3)
Common Emitter NPN BJT
ModeConditionBehavior
Cutoff
Active
Saturation
General NPN BJT
ModeConditionBehavior
Cutoff
Active
saturation
ModeEBJCBJActing
CutoffRev BiasRev BiasOpen sw.
ActiveFwd BiasRev BiasGood amp.
SaturationFwd BiasFwd BiasClosed sw.
Rev. ActiveRev BiasFwd BiasPoor amp.
