Lecture 13_ Feb 18 2011

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

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 13 Small-Signal Modeling and Linear Amplification Lecture 13 Covered Sections: 13.6, 13.7, 13.10 Common – Emitter Amplifier
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Common-Emitter Amplifier The actual gain of the amplifier was only -130. Where is most of this gain being lost?
Background image of page 2
Common-Emitter Amplifier A vt = − g m R L = −9.80 mS (18 k Ω) = −176
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
Common-Emitter Amplifier Assume this circuit was correctly designed so that the transistor is in the active region. Leaving everything else unchanged, a slight decrease in R1 causes
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

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

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online