m3_eqns - Equations and parameter values for EECE 254...

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Equations and parameter values for EECE 254 (Module 3) Current - Voltage Relationships for npn Transistors (for pnp transistors, replace v BE with v EB & replace v CE with v EC ) Active Mode: i C + i B + i E = 0 i C = ± i E = ² i B where = 1 + or = 1 ³ i C = I s e v BE / V T i E = i C = I s e v BE / V T i B = i C = I s e v BE / V T ´ µ · V A = ¸ i C ± I s e v BE T 1 + v CE V A ¹ º » ¼ ½ ¾ ± I C 1 + v CE V A ¹ º » ¼ ½ ¾ ; V A < ¸ r o ± V A I C I s ± A E qD n n i 2 N A W , ± D p D n N A N D W L p + 1 2 W 2 D ¿ b ¹ º » ¼ ½ ¾ ³ 1 Saturation Mode: v BE ± 0.7 V v CE = V CE ( sat ) À constant (typically, 0.2 V Á V CE ( sat ) Á 0.3 V ) i C i B Á F (and usually denoted forced ) Cutoff Mode: i C ± i B ± i E ± 0 Some Parameters and Constants V T ± k B T q ± 25 mV (at Room Temp.) q = 1.6 ² 10 ³ 19 Coulombs Small - Signal Model Parameters g m = I C V T r ´ = V T I B = µ V
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This note was uploaded on 12/21/2010 for the course EECE EECE 254 taught by Professor Robinturner,purangabomasumi during the Spring '09 term at The University of British Columbia.

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