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bjtlogic-4sp - Discharge path and Base-Driving circuitry 4...

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1 BJT Transistors BJT Fabrication Example Multi-Emitter Fabrication Examples NPN BJT
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2 Ebers-Moll NPN BJT Model ) 1 e ( I I T BE V / V ES BE , D = ) 1 e ( I I T BC V / V CS BC , D = BC , D R BE , D E I I I α = BC , D BE , D F C I I I = α C E B I I I = CS R ES F I I α α = = S I Reciprocity theorem transport saturation current Reverse active (RA) Forward Reverse Saturation (SAT) Forward Forward Forward active (FA) Reverse Forward Cutoff (OFF) Reverse Reverse Mode BC junction BE junction BJT Modes of Operation Reduced models of the operation modes (a) Cutoff (b) Forward active (c) Saturation (d) Reverse active F F F 1 α α β = R R R 1 α α β = 1 I I B F C = σ σβ IV Characteristics
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3 Modes of Operation Examples β F = 65 I C , I B = ? Base and emitter voltages = ? TTL Circuit Design Output-High Pull-up Driver
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