bjt - ECEN 325 Electronics Bipolar Junction Transistors Dr....

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ECEN 325 Electronics Bipolar Junction Transistors Dr. Aydın ˙ Ilker Kar¸ sılayan Department of Electrical and Computer Engineering
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Bipolar Junction Transistor Bipolar Junction Transistor Emitter Base Collector C B NPN E n p n C Collector PNP E p n p B Emitter Base Mode Base-Emitter Base-Collector Cutoff Reverse Reverse Active Forward Reverse Reverse Active Reverse Forward Saturation Forward Forward ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 1
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BJT Large-Signal Model BJT Large-Signal Model Active i C i B i C i E PNP B i E C E C B NPN i v BE v CB v EB v BC B E V CE V CE,sat i B = I S β e v BE / V T i C = I S e v BE / V T V EC V EC,sat i B = I S β e v EB / V T i C = I S e v EB / V T ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 2
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I C -V CE Characteristics I C -V CE Characteristics NPN BE4 V BE3 V BE2 V BE1 V CE I C I C V CE V BE Saturation Active region V CE,sat V ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 3
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I C -V EC Characteristics I C -V EC Characteristics PNP EB4 V EB3 V EB2 V EB1 V EC I C I C V EC V EB Saturation Active region V EC,sat V ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 4
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BJT DC Model BJT DC Model Active I B C E 0.7V β E B 0.7V β I E I B C I E I C I C I B I B R o R o B V CE V CE,sat V BE = 0.7 V V EC V EC,sat V EB = 0.7 V α = β/ ( β + 1) I C = β I B = α I E I E = ( β + 1)I B = I C I B = I C = I E / ( β + 1) ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 5
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BJT DC Biasing BJT DC Biasing Resistive R C R B1 V CC -V EE R B2 R E R B1 R B2 V CC -V EE R C R E ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 6
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BJT DC Biasing BJT DC Biasing Current Source R B1 R B2 V CC -V EE R C R C R B1 V CC -V EE R B2 I n I p ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 7
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BJT DC Biasing BJT DC Biasing Current Source -V EE V CC V CC V CC I n I p I p I n -V EE -V EE R 1 R 2 R 3 R 2 R 1 R 3 ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 8
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BJT DC Biasing BJT DC Biasing Current Source -V EE V CC V CC -V EE V CC -V EE I n I n I p I p R X R X ECEN 325 Electronics - Aydın ˙ I. Kar¸ sılayan - Bipolar Junction Transistors 9
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BJT Small-Signal Operation BJT Small-Signal Operation Transconductance V BE v be i B i E i C V CE v BE
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bjt - ECEN 325 Electronics Bipolar Junction Transistors Dr....

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