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lecture14 - = T BC T BE V v S V v F S E e I e I i α 29 1...

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Bipolar Junction Transistors. DEVICE STRUCTURE AND PHYSICAL OPERATION Simplified Structure and Modes of Operation npn transistor pnp transistor The transistor consists of two pn junctions, the EBJ and the CBJ BJT Modes of Operation Mode EBJ CBJ Cutoff Reverse Reverse Active Forward Reverse Reverse Active Reverse Forward Saturation Forward Forward Operation of the npn in the Active Mode
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T V vbe p p e n n / 0 ) 0 ( = To obtain the collector current, the derivation is similar to that for the current in the diode. T BE V v S C e I i / = W N n qD A I A i n E S 2 = ; E A Cross section of EBJ, p L hole diffusion length in the emitter, b τ minority-carrier lifetime in the base. β S B I i = ; + = b n p D A n p D W L W N N D D τ β 2 2 1 / 1 B C E i i i + = C E i i β β 1 + = T V vbe S E e I i / 1 β β + = E C i i α = 1 + = β β α ; 1 - = α α β Large Signal Equivalent Circuit Model Large Signal Equivalent Circuit Model
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Structure of Actual Transistors The Ebers-Moll (EM) Model ( 29 )
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Unformatted text preview: = T BC T BE V v S V v F S E e I e I i α ( 29 ) 1 ( 1 / /---= T BC T BE V v R S V v S C e I e I i ( 29 ) 1 ( 1 / /---= T BC T BE V v R S V v F S B e I e I i β 1 + = 1-= F F F 1-= R R R s SC R SE F I I I = = The pnp Transistor Circuit Symbols and Conventions Example 5.1 mA V v BE 1 @ 7 . ; 100 = = β . Design the circuit such that the collector current is 2 mA and the collector voltage is + 5V. Exercise 5.10 7 . = BE v . Find I E , I B , I C and V C Exercise 5.11 V V V V E b 7 . 1 ; . 1 = = . What are α and β Example 5.10 100 = . Determine the voltage at all nodes and the currents through all branches....
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