L20_trans - ESC102 Introduction to Electronics Transistor...

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Transistor Amplifiers ESC102 : Introduction to Electronics A R Harish Dept. of EE, IIT Kanpur Sept 14, 2010
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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 β = Current Gain 0; 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
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Let us analyze this circuit Choose R C = 1 k V i < V γ Transistor in cut off I B =0; I C =0 V 0 =V CC V CC 5 V R C R B 47 k V i V 0 I B I C V BE + - V CE + -
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V o vs V i 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 V o (V ) V i (V)
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V o as V i increases … R C = 1 k V i > V γ KVL in the BE loop: V CC 5 V R C R B 47 k V i V 0 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?
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V i > V γ KVL in the CE loop: As V i increases … CE C C CC V R I V + = V CC 5 V R C R B 47 k V i V 0 I B I C V BE + - V CE + - B BE i B R V V I - = C C CC CE R I V V V - = = 0 B C I I β = 100 = β
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V o as V i increases …
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How low can it go?
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