Lecture16-BJT+Small+Signal+Model

Lecture16-BJT+Small+Signal+Model - ECE 3040 Dr Ying Zhang...

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Unformatted text preview: ECE 3040 - Dr. Ying Zhang Georgia Tech ECE 3040: Microelectronic Circuits Lecture 16 Reading: Jaeger 13.5-13.6, Notes ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture BJT Simplified Performance Parameters • Heavier emitter doping than base doping, N E >>N B , improves emitter efficiency (->1), dc common base current gain (->1), and dc common emitter current gain (larger) • A narrow base, W<<L B , improves base transport factor (->1) ), dc common base current gain (->1), and dc common emitter current gain (larger) ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture BJT Simplified Performance Parameters If L B >>W (most of the minority carriers make it across the base), DC DC B E E E B B E E B B E DC DC DC E E B B E B E E B B E DC WN D N L D L W N L D WN D and N L D WN D L W N L D WN D α α β β β α − = ⇒ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + = + = + ⇒ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + = 1 2 1 1 1 1 1 2 1 1 1 2 2 ECE 3040 - Dr. Ying Zhang Georgia Tech ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = 1 1 1 1 T CB T EB T CB T EB V V R V V C V V V V F E e I e A I e A e I I ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − ⎟ ⎟ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − ⎟ ⎟ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − ⎟ ⎟ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜...
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Lecture16-BJT+Small+Signal+Model - ECE 3040 Dr Ying Zhang...

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