L20_trans - Transistor Amplifiers ESC102 : Introduction to...

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Unformatted text preview: Transistor Amplifiers ESC102 : Introduction to Electronics A R Harish Dept. of EE, IIT Kanpur Sept 14, 2010 Forward Active Mode Base Emitter (BE) junction is forward biased and Base Collector (BC) junction is reverse biased 0.7 BE V V 2245 F B C I I = Current Gain 0; 0; B C E I I I 2245 2245 2245 Transistor acts like an open circuit Cut off Mode Both the junctions are reverse biased Saturation Mode Both the junctions are forward biased 0.7 BE V V 2245 0.5 BC V V 2245 0.2 BE BC V V V- 2245 Let us analyze this circuit Choose R C = 1 k V i < V Transistor in cut off I B =0; I C =0 V =V CC V CC 5 V R C R B 47 k V i V I B I C V BE +- V CE +- V o vs V i 1 2 3 4 5 6 0.2 0.4 0.6 0.8 V o (V) V i (V) V o as V i increases R C = 1 k V i > V KVL in the BE loop: V CC 5 V R C R B 47 k V i V I B I C V BE +- V CE +- BE B B i V R I V + = B BE i B R V V I- = Load line? V i > V KVL in the CE loop: As V i increases CE C C CC V R I V...
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L20_trans - Transistor Amplifiers ESC102 : Introduction to...

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