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EEE107

EEE107. Transistors. Emitter. Collector. Emitter. Collector. Base. Base. N. P. N. P. N. P. (a) N-P-N transistor. (b) P-N-P transistor. Types of bipolar transistor. Collector C. Base B. Collector C. Base B. Emitter E. Emitter E. (a) N-P-N. (a) P-N-P.

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EEE107

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  1. EEE107 Transistors

  2. Emitter Collector Emitter Collector Base Base N P N P N P (a) N-P-N transistor (b) P-N-P transistor Types of bipolar transistor

  3. Collector C Base B Collector C Base B Emitter E Emitter E (a) N-P-N (a) P-N-P Bipolar transistor symbols

  4. Operation of an n-p-n transistor E B C Electrons Electrons Ic N P N Vcb C A few holes B Ic Ib Ie Holes E Vbe Ie Ib Vbe Vcb (a) Physical circuit (b) Symbolic circuit

  5. Holes Holes P N P A fewelectrons C E B Ic Ie Electrons Ib Vbe Vcb Operation of a p-n-p transistor

  6. Current Relationships In a Transistor Emitter Current = Collector Current plus Base Current Collector Current is nearly equal to Emitter Current Defining the Collector-Base Current Gain Collector-Base Current Gain is typically ~100

  7. +VCC = + 15 V Input signal Bipolar Transistor Amplifier RC R1 5 k C2 100k amplified output signal C1 .22μF .1μF 47μF Vo 50k Vi R2 CE RE 4.7k

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