Lecture 13_ Feb 18 2011

Lecture 13_ Feb 18 2011 - Chapter 13 Small-Signal Modeling...

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Chapter 13 Small-Signal Modeling and Linear Amplification Lecture 13 Covered Sections: 13.6, 13.7, 13.10 Common – Emitter Amplifier
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Common-Emitter Amplifier The actual gain of the amplifier was only -130. Where is most of this gain being lost?
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Common-Emitter Amplifier A vt = − g m R L = −9.80 mS (18 k Ω) = −176
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Common-Emitter Amplifier Assume that the circuit below has been designed according to the “rules of thumb” so that V CE = 5 V and I C = 2 mA but that we find that the bias circuit is not stable enough against variations in the transistor beta. To improve the stability, a knowledgeable designer would make one change, and then re-design the rest of the circuit so that V CE = 5 V and I C = 2 mA. What change would be most effective in making the circuit more stable? a) increase R C b) decrease R C c) increase R E d) decrease R E e) increase V CC f) decrease V CC
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Common-Emitter Amplifier Assume this circuit was correctly designed so that the transistor is in the active region.
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