bjtlogic-2sp - Discharge path and Base-Driving circuitry 7...

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1 BJT Transistors BJT Fabrication Example
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2 Multi-Emitter Fabrication Examples NPN BJT
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3 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 = C E B I I I = CS R ES F I I = = 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
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4 Reduced models of the operation modes (a) Cutoff (b) Forward active (c) Saturation (d) Reverse active F F F 1 α β = R R R 1 = 1 I I B F C = σ σβ IV Characteristics
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5 Modes of Operation Examples β F = 65 I C , I B = ? Base and emitter voltages = ?
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6 TTL Circuit Design Output-High Pull-up Driver Output-Low Pull-down Driver
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Unformatted text preview: Discharge path and Base-Driving circuitry 7 Power Dissipation Example Resistor-Transistor Logic (RTL) 8 INVERTER Voltage Transfer Characteritics (VTC) ) FA ( BE IL V V = B C F ) SAT ( CE CC ) SAT ( BE IH R R V V V V β − + = NOR NAND 9 RTL Fan-out RTL fan-out analysis 10 RTL fan-out analysis Maximum fan-out? ⎥ ⎦ ⎥ ⎢ ⎣ ⎢ = IN OUT I I N C OUT CC OUT R V V I − = B ) SAT ( BE OUT IN R V V I − = IH OUT V V = B C F ) SAT ( CE CC ) SAT ( BE IH R R V V V V β − + = 11 RTL NONINVERTER 12 AND OR...
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bjtlogic-2sp - Discharge path and Base-Driving circuitry 7...

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