L19_trans - ESC102 : Introduction to Electronics Transistor...

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Transistor ESC102 : Introduction to Electronics A R Harish Dept. of EE, IIT Kanpur Sept 9 and 13, 2010
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Bipolar Junction Transistor (BJT) NPN PNP E P N N B C C B E E: Emitter B: Base C: Collector E E B C B C P P N E: Emitter B: Base C: Collector
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Dc current-voltage Characteristics of NPN Transistor C B E C B E I I I + = Two independent currents Let them be I B and I C There can be three voltages: , , BE BC CE V V V Again, only two are independent. Often V BE and V CE are chosen. ; ; BE B E BC B C CE C E V V V V V V V V V = - = - = - BC BE CE V V V = - CE BE BC V V V = -
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Dc current-voltage Characteristics of NPN Transistor I B1 I B2 I B4 I B3 C B E ( , ) ; ( , ) C B BE CE I I V V
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Modes of operation V BE Forward Active (F,R) V BC Reverse Active (R,F) Cut Off (R,R) Saturation (F,F) N P N E C B + V BE - + V BC - C B E
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I B1 I B2 I B4 I B3 Forward Active Mode 10 μ A 20 μ A 30 μ A 40 μ A F B C I I β = 1.7 mA 3.7 mA 5.6 mA 7.6 mA ~0.2V
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P N E C B N + Forward Active Mode Base Emitter (BE) junction is forward biased and Base Collector (BC) junction is reverse biased 0.7V 5V 0.7 BE V V 2245 F B C I I β = Current Gain
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C B E P N E C B N + β F .I B B E C I B I C Forward Active Mode β F .I B B E C I C I B 0.7V
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This note was uploaded on 12/08/2010 for the course EE ESC102 taught by Professor A.r.harish during the Spring '10 term at IIT Kanpur.

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L19_trans - ESC102 : Introduction to Electronics Transistor...

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