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25.02.2015
1
Lecture 4
February 17, 2015
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EEE 312 Electronic Circuits
BJT AC Analysis
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DARLINGTON CONNECTION
• A very popular connection of two bipolar junction transistors foroperation as one “super- beta” transistor is the Darlingtonconnection shown in Figure
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DARLINGTON CONNECTION-Emitter Follower
• DC Bias
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DARLINGTON CONNECTION-Emitter Follower
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DARLINGTON CONNECTION-AC input impedance
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DARLINGTON CONNECTION-AC Current Gain
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DARLINGTON CONNECTION-AC Voltage Gain
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DARLINGTON CONNECTION-AC Output Impedance
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DARLINGTON CONNECTION-AC Output Impedance
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DARLINGTON CONNECTION-Voltage Divider
• DC Bias
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DARLINGTON CONNECTION-Voltage Divider
• AC Input Impedance
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DARLINGTON CONNECTION-Voltage Divider
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• AC Current Gain
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DARLINGTON CONNECTION-Voltage Divider
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FEEDBACK PAIR
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FEEDBACK PAIR
• AC Operation
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FEEDBACK PAIR
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• AC Operation
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FEEDBACK PAIR