Extra Credit Exercise 1

Extra Credit Exercise 1 - amplifier circuit. Using the...

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Analysis of a Bipolar Junction Transistor Amplifier Biasing Circuit Bipolar Junction Transistor A BJT is a three terminal device used in amplifier circuits. The three terminals are designated Emitter (E), Base (B), Collector (C). This device can be modeled using a dependent current source. Figure 1 Figure 2 The dependent source, I β B , used to model the current I C in the Collector (C) depends on current I B entering the Base (B) terminal. Applying KCL at the Emitter (E) terminal gives us a relationship between the three terminal currents: I E = I B + I C
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The transistor biasing circuit shown below in Figure (a) is a common-emitter (CE)
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Unformatted text preview: amplifier circuit. Using the dependent source equivalent, we get the circuit shown in Figure (b). To find I B , we can write KCL at the base node (labeled B). Note that V B = 0.7V (assume that the emitter is used as the reference node)-I 1 + I 2 + I B = 0-(2-0.7)/100k + 0.7/200k + I B = 0 I B = 9.5 A To find we can write KVL for the output loop:-16 + 1k * 150I B + Vo = 0 Vo = 14.575V Extra- credit problems: Problems 3.89, 3.90, 3.91, 3.92...
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Extra Credit Exercise 1 - amplifier circuit. Using the...

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