Lecture_26

# Lecture_26 - Find R i in two steps first find the...

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The Common-Emitter Amplifier Model this amplifier circuit and then determine the voltage gain ( v o / v i ), input resistance ( R i ) and output resistance ( R o ). V BE (on) = 0.7 V, β = 100, V A = 100 V, I CQ = 950 μ A r r o B C v be g m v be or i b i b E E First get values for the model parameters: Next solve for the voltage gain: EE 310 Lecture 26 Lecture 26 Page 1

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Analysis (Continued) V BE (on) = 0.7 V, β = 100, V A = 100 V, I CQ = 950 μ A Next find the input resistance: Finally, find the output resistance: EE 310 Lecture 26 r r o B C v be g m v be or i b i b E E Lecture 26 Page 2
Amplifier with Emitter Resistor Included V BE (on) = 0.7 V, β = 100, V A = V, I CQ = 2.16 mA Sketch a model of this circuit: r r o B C v be g m v be or i b i b E E EE 310 Lecture 26 Lecture 26 Page 3

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Amplifier with Emitter Resistor (Continued)

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Unformatted text preview: Find R i in two steps; first find the intermediate resistance R ib : g m = 83.1 mA/V, β = 100, r o = ∞, r π = 1.20 k Ω EE 310 Lecture 26 Finally, combine R ib with R 1 and R 2 to find R i : Lecture 26 Page 4 Amplifier with Emitter Resistor (Continued) Now find the voltage gain ( v o / v i ): g m = 83.1 mA/V, β = 100, r o = ∞, r π = 1.20 k Ω EE 310 Lecture 26 Lecture 26 Page 5 CE Amplifier with a Bypass Capacitor Across R E What do we expect to happen if R E is bypassed with C E ? g m = 83.1 mA/V, β = 100, r o = ∞, r π = 1.20 k Ω EE 310 Lecture 26 Lecture 26 Page 6...
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