22 - BJT - EECS 320 Bipolar Junction Transistor Transistor...

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EECS 320 Bipolar Junction Transistor J. Phillips EECS 320 Transistor tran•sis•tor (trán-zìs’ter) A solid-state electronic device that is used to control the flow of electricity in electronic equipment and consists of a small block of a semiconductor with at least three electrodes Trans(fer) + (res)istor Idea: control large output with small input This device should exhibit gain T Input Output Source
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J. Phillips EECS 320 Bipolar Transistor Analog Input Source Output Digital Gain: Signal amplification Switch: on or off Integrate many devices into a circuit Source Input Output Realization of signal processing electronically Realization Of Boolean logic electronically J. Phillips EECS 320 Bipolar Transistor Operation B C I I = β I B I E I C B C E Collector Base Emitter E C dc I I ~ α “Forward Active” “Saturation” Amplifiers : typically operate in forward active mode (I C = β I B ) Digital logic : typically operate in saturation (low) or off (high)
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J. Phillips EECS 320 Bipolar Transistor Input controls bump height Output = water flow Goal: Control output with small input
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This note was uploaded on 01/31/2011 for the course EECS 320 taught by Professor Philips during the Spring '06 term at University of Michigan.

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22 - BJT - EECS 320 Bipolar Junction Transistor Transistor...

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