Lecture_27 - Lecture 27 Page 4 The Common-Base Amplifier(Continued Solve first for the input resistance R i by first finding the intermediate

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
EE 310 Lecture 27 The Common-Collector Amplifier Sketch a model of this circuit: r r o B C v be g m v be or i b i b E E Lecture 27 Page 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
Ready for Analysis Find v o in terms of i b : Express i b in terms of v o and v b : Express v b in terms of vi and R i : Combine and solve for v o / v i : EE 310 Lecture 27 Lecture 27 Page 2
Background image of page 2
Emitter-Follower Output Resistance Solve for the output resistance, R o . r π = 3.28 kΩ, β = 100, r o = 100 kΩ, R E = 400 Ω, R S = 500 Ω, R 1 = R 2 = 50 kΩ Simplify by defining an intermediate current, i x ' and then finding R o in terms of r o , R E , and v x / i x ' : Now find i x ' in terms of i b : Then find v x / i x ' : Finally, find R o : EE 310 Lecture 27 Lecture 27 Page 3
Background image of page 3

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

View Full DocumentRight Arrow Icon
The Common-Base Amplifier r r o B C v be g m v be or i b i b E E Sketch a model of the amplifier circuit: Rearrange the model: EE 310 Lecture 27
Background image of page 4
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 27 Page 4 The Common-Base Amplifier (Continued) Solve first for the input resistance, R i by first finding the intermediate resistance R ie : R i R ie Now combine R ie and R E in parallel to find R i : EE 310 Lecture 27 Lecture 27 Page 5 The Common-Base Amplifier (Continued) Now solve for the voltage gain. First express v o as a function of v π : R i Next express V π as a function of v i : Finally, divide to get v o / v i : EE 310 Lecture 27 Lecture 27 Page 6 Summary A single transistor is seldom enough to build an amplifier with reasonable characteristics: EE 310 Lecture 27 Lecture 27 Page 7...
View Full Document

This note was uploaded on 10/12/2010 for the course E E 310 at Pennsylvania State University, University Park.

Page1 / 7

Lecture_27 - Lecture 27 Page 4 The Common-Base Amplifier(Continued Solve first for the input resistance R i by first finding the intermediate

This preview shows document pages 1 - 7. Sign up to view the full document.

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