Lec21 BJT - EECS 320 Bipolar Junction Transistor Transistor...

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EECS 320 Bipolar Junction Transistor
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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 T Input Output Source Trans(fer) + (res)istor Idea: control large output with small input This device should exhibit gain
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Bipolar Transistor Analog Digital Gain: Signal amplification Switch: on or off Realization of signal processing electronically Realization Of Boolean logic electronically Source Input Output Input Source Output Integrate many devices into a circuit
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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” “Saturat ion” 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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Bipolar Transistor Goal: Control output with small input Analogy: Bump controls water flow “Off” Input controls bump height Output = water flow “On” Electronics analogy Water flow = electron or hole current Bump = electronic potential
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Lec21 BJT - EECS 320 Bipolar Junction Transistor Transistor...

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