Lecture 28 - BJT Steady-State Response 2

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1 BJT Steady-State Response Objective: To quantitatively describe the BJT’s behavior in steady-state. Questions to be answered: • How do we determine (quantitatively) the BJTs output characteristics? EE360 – Lecture 28 Ebers-Moll Model: Large Signal Equivalent Circuit for the BJT • Model: 2 diodes and 2 current sources. • Diode currents are given by From Pierret, pg. 404. EE360 – Lecture 28 • Terminal currents are given by () F F R R B R F F C R R F E I I I I I I I I I α + = = = 1 1

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2 () 00 0 11 CB EB qV kT qV kT EB B B B E BB B E DD D L W qA n p e p e LL L L W I ⎛⎞ =+ ⎜⎟ ⎝⎠ Ebers-Moll Model: Parameters • To use the model we need to know I F0 , I R0 , α R , and α F • Terminal currents for the BJT: 0 CB EB qV kT qV kT C B BC B B B C D DL D W p e n p e LW L I =− + • Compare to Ebers-Moll model: ) 1 ( ) 1 ( ) 1 ( ) 1 ( / 0 / 0 / 0 / 0 = = kT qV R kT qV F F C kT qV R R kT qV F E CB EB CB EB e I e I I e I e I I α EE360 – Lecture 28 0 0 C B B B FE B RC B CB D L D L Iq An p p W W ⎡⎤ ⎢⎥ ⎣⎦ 0 because F FR R B B E C B II q A p I I I αα == = 0 0 and R F dc R
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