Duo-diode Models of BJT
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The document describes the Ebers-Moll model and Charge-Control model for bipolar junction transistors (BJTs). The Ebers-Moll model treats a BJT as two diodes and defines relationships between the base-emitter, base-collector, and collector currents. However, it cannot account for effects like the Early effect. The Charge-Control model tracks the storage of charges in the normal and inverted regions and defines transit times, improving its accuracy over the Ebers-Moll model.
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for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
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- 1. Bipolar Junction Transistor: Duo-Diode Model Arpan Deyasi Dept of ECE, RCCIIT, Kolkata, India 1/5/2021 Arpan Deyasi, RCCIIT 1
- 2. 1/5/2021 Arpan Deyasi, RCCIIT 2 Ebers-Moll Model A model which deals with the equivalent circuit of a BJT with two-diode theory n p n n p np
- 3. 1/5/2021 Arpan Deyasi, RCCIIT 3 Ebers-Moll Model n p np E C B E C B
- 4. 1/5/2021 Arpan Deyasi, RCCIIT 4 Ebers-Moll Model αF: Common-Emitter current gain IR: Base-Collector reverse current C F F RI I Iα= −
- 5. 1/5/2021 Arpan Deyasi, RCCIIT 5 Ebers-Moll Model exp 1BE F ES qV I I kT − exp 1BC R CS qV I I kT = − exp 1 exp 1 BE C F ES BC CS qV I I kT qV I kT α − − −
- 6. 1/5/2021 Arpan Deyasi, RCCIIT 6 Ebers-Moll Model αR: Common-Base current gain in reverse mode IF: Base-Emitter forward current E R R FI I Iα= −
- 7. 1/5/2021 Arpan Deyasi, RCCIIT 7 exp 1BE F ES qV I I kT − exp 1BC R CS qV I I kT = − Ebers-Moll Model exp 1 exp 1 BC E R CS BE ES qV I I kT qV I kT α − − −
- 8. 1/5/2021 Arpan Deyasi, RCCIIT 8 CE B Ebers-Moll Model: Equivalent Circuit R CS F ESI Iα α= VBE VBC
- 9. 1/5/2021 Arpan Deyasi, RCCIIT 9 Ebers-Moll Model 0B E CI I I+ + = B E CI I I=− −
- 10. 1/5/2021 Arpan Deyasi, RCCIIT 10 exp 1 exp 1 exp 1 exp 1 BC BE B R CS ES BCBE F ES CS qV qV I I I kT kT qVqV I I kT kT α α =− − + − − − + − Ebers-Moll Model
- 11. 1/5/2021 Arpan Deyasi, RCCIIT 11 ( ) ( ) exp 1 1 exp 1 1 BE B ES F BC CS R qV I I kT qV I kT α α = − − + − − Ebers-Moll Model
- 12. 1/5/2021 Arpan Deyasi, RCCIIT 12 The original Ebers-Moll model can't capture the Early Effect or any charge storage effects. Ebers-Moll Model: Disadvantage
- 13. 1/5/2021 Arpan Deyasi, RCCIIT 13 Charge-Control Model EC B αIIC αNIE exp 1BE ES qV I kT − exp 1BC CS qV I kT −
- 14. 1/5/2021 Arpan Deyasi, RCCIIT 14 Charge-Control Model QN: charge stored in normal distribution QI: charge stored in inverted distribution τtN/ τtI : transit time for normal/inverted mode for charge collection at collector τpN/ τpI : transit time for normal/inverted mode for recombination at base
- 15. 1/5/2021 Arpan Deyasi, RCCIIT 15 Charge-Control Model N CN tN Q I τ = N N EN tN pN Q Q I τ τ = + Normal mode Inverted mode I EI tI Q I τ = − I I CI tI pI Q Q I τ τ =− −
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- 17. 1/5/2021 Arpan Deyasi, RCCIIT 17 Charge-Control Model Net base current N N NI I I B tN pN tI tN tI pI Q Q QQ Q Q I τ τ τ τ τ τ =− − + − + + B E CI I I=− − 1 1 1 1 1 1 B N tN pN tN I tI tI pI I Q Q τ τ τ τ τ τ =− + + + + +